Focus on:
All days
Sep 15, 2014
Sep 16, 2014
Sep 17, 2014
Sep 18, 2014
Sep 19, 2014
Sep 20, 2014
Sep 21, 2014
Sep 22, 2014
Sep 23, 2014
Sep 24, 2014
Sep 25, 2014
Sep 26, 2014
Sep 27, 2014
Sep 28, 2014
Sep 29, 2014
Sep 30, 2014
Oct 1, 2014
Oct 2, 2014
Oct 3, 2014
Oct 4, 2014
Oct 5, 2014
Oct 6, 2014
Oct 7, 2014
Oct 8, 2014
Oct 9, 2014
Oct 10, 2014
Indico style
Indico style  inline minutes
Indico style  numbered
Indico style  numbered + minutes
Indico Weeks View
Back to Conference View
Choose Timezone
Use the event/category timezone
Specify a timezone
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau
Africa/Blantyre
Africa/Brazzaville
Africa/Bujumbura
Africa/Cairo
Africa/Casablanca
Africa/Ceuta
Africa/Conakry
Africa/Dakar
Africa/Dar_es_Salaam
Africa/Djibouti
Africa/Douala
Africa/El_Aaiun
Africa/Freetown
Africa/Gaborone
Africa/Harare
Africa/Johannesburg
Africa/Juba
Africa/Kampala
Africa/Khartoum
Africa/Kigali
Africa/Kinshasa
Africa/Lagos
Africa/Libreville
Africa/Lome
Africa/Luanda
Africa/Lubumbashi
Africa/Lusaka
Africa/Malabo
Africa/Maputo
Africa/Maseru
Africa/Mbabane
Africa/Mogadishu
Africa/Monrovia
Africa/Nairobi
Africa/Ndjamena
Africa/Niamey
Africa/Nouakchott
Africa/Ouagadougou
Africa/PortoNovo
Africa/Sao_Tome
Africa/Tripoli
Africa/Tunis
Africa/Windhoek
America/Adak
America/Anchorage
America/Anguilla
America/Antigua
America/Araguaina
America/Argentina/Buenos_Aires
America/Argentina/Catamarca
America/Argentina/Cordoba
America/Argentina/Jujuy
America/Argentina/La_Rioja
America/Argentina/Mendoza
America/Argentina/Rio_Gallegos
America/Argentina/Salta
America/Argentina/San_Juan
America/Argentina/San_Luis
America/Argentina/Tucuman
America/Argentina/Ushuaia
America/Aruba
America/Asuncion
America/Atikokan
America/Bahia
America/Bahia_Banderas
America/Barbados
America/Belem
America/Belize
America/BlancSablon
America/Boa_Vista
America/Bogota
America/Boise
America/Cambridge_Bay
America/Campo_Grande
America/Cancun
America/Caracas
America/Cayenne
America/Cayman
America/Chicago
America/Chihuahua
America/Costa_Rica
America/Creston
America/Cuiaba
America/Curacao
America/Danmarkshavn
America/Dawson
America/Dawson_Creek
America/Denver
America/Detroit
America/Dominica
America/Edmonton
America/Eirunepe
America/El_Salvador
America/Fort_Nelson
America/Fortaleza
America/Glace_Bay
America/Goose_Bay
America/Grand_Turk
America/Grenada
America/Guadeloupe
America/Guatemala
America/Guayaquil
America/Guyana
America/Halifax
America/Havana
America/Hermosillo
America/Indiana/Indianapolis
America/Indiana/Knox
America/Indiana/Marengo
America/Indiana/Petersburg
America/Indiana/Tell_City
America/Indiana/Vevay
America/Indiana/Vincennes
America/Indiana/Winamac
America/Inuvik
America/Iqaluit
America/Jamaica
America/Juneau
America/Kentucky/Louisville
America/Kentucky/Monticello
America/Kralendijk
America/La_Paz
America/Lima
America/Los_Angeles
America/Lower_Princes
America/Maceio
America/Managua
America/Manaus
America/Marigot
America/Martinique
America/Matamoros
America/Mazatlan
America/Menominee
America/Merida
America/Metlakatla
America/Mexico_City
America/Miquelon
America/Moncton
America/Monterrey
America/Montevideo
America/Montserrat
America/Nassau
America/New_York
America/Nipigon
America/Nome
America/Noronha
America/North_Dakota/Beulah
America/North_Dakota/Center
America/North_Dakota/New_Salem
America/Nuuk
America/Ojinaga
America/Panama
America/Pangnirtung
America/Paramaribo
America/Phoenix
America/PortauPrince
America/Port_of_Spain
America/Porto_Velho
America/Puerto_Rico
America/Punta_Arenas
America/Rainy_River
America/Rankin_Inlet
America/Recife
America/Regina
America/Resolute
America/Rio_Branco
America/Santarem
America/Santiago
America/Santo_Domingo
America/Sao_Paulo
America/Scoresbysund
America/Sitka
America/St_Barthelemy
America/St_Johns
America/St_Kitts
America/St_Lucia
America/St_Thomas
America/St_Vincent
America/Swift_Current
America/Tegucigalpa
America/Thule
America/Thunder_Bay
America/Tijuana
America/Toronto
America/Tortola
America/Vancouver
America/Whitehorse
America/Winnipeg
America/Yakutat
America/Yellowknife
Antarctica/Casey
Antarctica/Davis
Antarctica/DumontDUrville
Antarctica/Macquarie
Antarctica/Mawson
Antarctica/McMurdo
Antarctica/Palmer
Antarctica/Rothera
Antarctica/Syowa
Antarctica/Troll
Antarctica/Vostok
Arctic/Longyearbyen
Asia/Aden
Asia/Almaty
Asia/Amman
Asia/Anadyr
Asia/Aqtau
Asia/Aqtobe
Asia/Ashgabat
Asia/Atyrau
Asia/Baghdad
Asia/Bahrain
Asia/Baku
Asia/Bangkok
Asia/Barnaul
Asia/Beirut
Asia/Bishkek
Asia/Brunei
Asia/Chita
Asia/Choibalsan
Asia/Colombo
Asia/Damascus
Asia/Dhaka
Asia/Dili
Asia/Dubai
Asia/Dushanbe
Asia/Famagusta
Asia/Gaza
Asia/Hebron
Asia/Ho_Chi_Minh
Asia/Hong_Kong
Asia/Hovd
Asia/Irkutsk
Asia/Jakarta
Asia/Jayapura
Asia/Jerusalem
Asia/Kabul
Asia/Kamchatka
Asia/Karachi
Asia/Kathmandu
Asia/Khandyga
Asia/Kolkata
Asia/Krasnoyarsk
Asia/Kuala_Lumpur
Asia/Kuching
Asia/Kuwait
Asia/Macau
Asia/Magadan
Asia/Makassar
Asia/Manila
Asia/Muscat
Asia/Nicosia
Asia/Novokuznetsk
Asia/Novosibirsk
Asia/Omsk
Asia/Oral
Asia/Phnom_Penh
Asia/Pontianak
Asia/Pyongyang
Asia/Qatar
Asia/Qostanay
Asia/Qyzylorda
Asia/Riyadh
Asia/Sakhalin
Asia/Samarkand
Asia/Seoul
Asia/Shanghai
Asia/Singapore
Asia/Srednekolymsk
Asia/Taipei
Asia/Tashkent
Asia/Tbilisi
Asia/Tehran
Asia/Thimphu
Asia/Tokyo
Asia/Tomsk
Asia/Ulaanbaatar
Asia/Urumqi
Asia/UstNera
Asia/Vientiane
Asia/Vladivostok
Asia/Yakutsk
Asia/Yangon
Asia/Yekaterinburg
Asia/Yerevan
Atlantic/Azores
Atlantic/Bermuda
Atlantic/Canary
Atlantic/Cape_Verde
Atlantic/Faroe
Atlantic/Madeira
Atlantic/Reykjavik
Atlantic/South_Georgia
Atlantic/St_Helena
Atlantic/Stanley
Australia/Adelaide
Australia/Brisbane
Australia/Broken_Hill
Australia/Darwin
Australia/Eucla
Australia/Hobart
Australia/Lindeman
Australia/Lord_Howe
Australia/Melbourne
Australia/Perth
Australia/Sydney
Canada/Atlantic
Canada/Central
Canada/Eastern
Canada/Mountain
Canada/Newfoundland
Canada/Pacific
Europe/Amsterdam
Europe/Andorra
Europe/Astrakhan
Europe/Athens
Europe/Belgrade
Europe/Berlin
Europe/Bratislava
Europe/Brussels
Europe/Bucharest
Europe/Budapest
Europe/Busingen
Europe/Chisinau
Europe/Copenhagen
Europe/Dublin
Europe/Gibraltar
Europe/Guernsey
Europe/Helsinki
Europe/Isle_of_Man
Europe/Istanbul
Europe/Jersey
Europe/Kaliningrad
Europe/Kiev
Europe/Kirov
Europe/Lisbon
Europe/Ljubljana
Europe/London
Europe/Luxembourg
Europe/Madrid
Europe/Malta
Europe/Mariehamn
Europe/Minsk
Europe/Monaco
Europe/Moscow
Europe/Oslo
Europe/Paris
Europe/Podgorica
Europe/Prague
Europe/Riga
Europe/Rome
Europe/Samara
Europe/San_Marino
Europe/Sarajevo
Europe/Saratov
Europe/Simferopol
Europe/Skopje
Europe/Sofia
Europe/Stockholm
Europe/Tallinn
Europe/Tirane
Europe/Ulyanovsk
Europe/Uzhgorod
Europe/Vaduz
Europe/Vatican
Europe/Vienna
Europe/Vilnius
Europe/Volgograd
Europe/Warsaw
Europe/Zagreb
Europe/Zaporozhye
Europe/Zurich
GMT
Indian/Antananarivo
Indian/Chagos
Indian/Christmas
Indian/Cocos
Indian/Comoro
Indian/Kerguelen
Indian/Mahe
Indian/Maldives
Indian/Mauritius
Indian/Mayotte
Indian/Reunion
Pacific/Apia
Pacific/Auckland
Pacific/Bougainville
Pacific/Chatham
Pacific/Chuuk
Pacific/Easter
Pacific/Efate
Pacific/Fakaofo
Pacific/Fiji
Pacific/Funafuti
Pacific/Galapagos
Pacific/Gambier
Pacific/Guadalcanal
Pacific/Guam
Pacific/Honolulu
Pacific/Kanton
Pacific/Kiritimati
Pacific/Kosrae
Pacific/Kwajalein
Pacific/Majuro
Pacific/Marquesas
Pacific/Midway
Pacific/Nauru
Pacific/Niue
Pacific/Norfolk
Pacific/Noumea
Pacific/Pago_Pago
Pacific/Palau
Pacific/Pitcairn
Pacific/Pohnpei
Pacific/Port_Moresby
Pacific/Rarotonga
Pacific/Saipan
Pacific/Tahiti
Pacific/Tarawa
Pacific/Tongatapu
Pacific/Wake
Pacific/Wallis
US/Alaska
US/Arizona
US/Central
US/Eastern
US/Hawaii
US/Mountain
US/Pacific
UTC
Save
Europe/Stockholm
English (United States)
English (United Kingdom)
English (United States)
Español (España)
Français (France)
Polski (Polska)
Português (Brasil)
Türkçe (Türkiye)
Монгол (Монгол)
Українська (Україна)
中文 (中国)
Login
Computational Challenges in Nuclear and ManyBody Physics
from
Monday, September 15, 2014 (9:00 AM)
to
Friday, October 10, 2014 (6:00 PM)
Monday, September 15, 2014
8:45 AM
Registration

Elizabeth Yang
Registration
Elizabeth Yang
8:45 AM  9:30 AM
Room: Nordita building number 23
Performed by Nordita's secretary Elizabeth Yang. The registration will continue during the whole week. Therefore participants which do not reach to be registered during the period given here (i. e. 8:45  9:30) can do it afterwards, for instance within the lunch time.
9:30 AM
Welcome address

Axel Brandenburg
Welcome address
Axel Brandenburg
9:30 AM  10:00 AM
Room: FP41
Prof. Axel Brandenburg is a member of the Board and Deputy Director of Nordita.
10:00 AM
Defects in Nuclear Pasta

Charles Horowitz
Defects in Nuclear Pasta
Charles Horowitz
10:00 AM  10:40 AM
Room: FP41
Dense nuclear matter, near the base of the crust in neutron stars, is expected to have complex nuclear pasta shapes because of coulomb frustration. Competition between shortrange nuclear attraction and longrange coulomb repulsion insures that many different shapes have very similar energies. We report largescale molecular dynamics simulations of nuclear pasta and find longlived topological defects. These defects could increase electron pasta scattering and reduce the electrical and thermal conductivities. A reduced thermal conductivity may be visible in Xray observations of neutron star crust cooling. A reduced electrical conductivity could lead to the decay of magnetic fields.
10:40 AM
Coffee break
Coffee break
10:40 AM  11:00 AM
Room: 132:028
11:00 AM
TimeDependent Dynamics of Fermionic Superfluids: from cold atomic gases, to nuclei and neutron stars

Aurel Bulgac
TimeDependent Dynamics of Fermionic Superfluids: from cold atomic gases, to nuclei and neutron stars
Aurel Bulgac
11:00 AM  11:40 AM
Room: FP41
The fascinating dynamics of superfluids, often referred to as quantum coherence revealed at macroscopic scale, has challenged both experimentalists and theorists for more than a century now, starting with electron superconductivity discovered in 1911 by Heike Kamerlingh Onnes. The phenomenological twofluid model of Tizsa and its final formulation due to Landau, is ultimately a classical approach in which Planck’s constant never appears and it is unable to describe the generation and dynamics of the quantized vortices, which are the hallmark characteristics of superfluidity. Various quantum mechanical phenomenological models have been developed over the years by London, Onsager, Feynman, Ginzburg and Landau, Abrikosov, and many others, but truly microscopic approaches are very scarce. The GrossPitaevskii equation was for many years the only example, but it is applicable only to a weakly interacting Bose gas at zero temperature and it has been used to describe the large variety of experiments in cold atomic Bose gases. In the case of fermionic superfluids only a timedependent mean filed approach existed for a long time, which is known to be quite inaccurate. With the emergence of the Density Functional Theory and its timedependent extension it became relatively recently possible to have a truly microscopic approach of their dynamics, which proves to be extremely relabel in predicting and describing various experimental results in cold atomic fermionic gases, nuclei and which can be used as well to make predictions about the nature and dynamics of vortices in the neutron star crust. I will describe the timedependent superfluid local density approximation, which is an adiabatic extension of the density functional theory to superfluid Fermi systems and their realtime dynamics. This new theoretical framework has been used to describe/predict a range of phenomena in cold atomic gases and nuclear collective motion: excitation of the Higgs modes in strongly interacting Fermi superfluids, generation of quantized vortices, crossing and reconnection of vortices, excitation of the superflow at velocities above the critical velocity, excitation of quantum shock waves, domain walls and vortex rings in superfluid atomic clouds, and excitation of collective states in nuclei. This approach is the natural framework to describe in a timedependent framework various low energy nuclear reactions and in particular large amplitude collective motion and nuclear fission and the numerical implementation of this formalism requires the largest supercomputers available to science today.
11:40 AM
Lattice tightbinding Bogoliubovde Gennes approach to nonuniform superconductivity: Josephson junctions, vortices, and disorder

Annica BlackSchaffer
Lattice tightbinding Bogoliubovde Gennes approach to nonuniform superconductivity: Josephson junctions, vortices, and disorder
Annica BlackSchaffer
11:40 AM  12:20 PM
Room: FP41
I will present results on using a lattice tightbinding Bogoliubovde Gennes formulation of nonuniform superconducting systems and solving selfconsistently for the superconducting order parameter. Systems studied include Josephson junctions in graphene and spinorbit coupled semiconductors, superconducting vortices in spinorbit coupled semiconductors, and studies of the local effect of impurities and disordered edges in unconventional superconductors. While the method has limitations, especially with regards to system sizes possible to study, it offers a microscopically accurate description of the superconducting state, which can be crucial for a correct physical description of nonuniform superconducting systems.
12:20 PM
Discussion
Discussion
12:20 PM  1:00 PM
Room: FP41
1:00 PM
Lunch
Lunch
1:00 PM  2:30 PM
Room: 132:028
2:30 PM
Nuclear and particlephysics aspects of condensedmatter nanosystems

Constantine Yannouleas
Nuclear and particlephysics aspects of condensedmatter nanosystems
Constantine Yannouleas
2:30 PM  3:10 PM
Room: FP41
The physics of condensedmatter nanosystems exhibits remarkable analogies with atomic nuclei. Examples are: Plasmons corresponding to Giant resonances [1], electronic shells, de formed shapes, and fission [2], betatype decay, strongly correlated phenomena associated with symmetry breaking and symmetry restoration [3], etc. Most recently, analogies with relativistic quantumfield theories (RQFT) and highenergy particle physics are beeing explored in the field of graphene nanostructures [4]. The talk will review these analogies focusing in particular on the following three aspects: (1) The shellcorrection method (SCM, commonly known as Strutinsky’s averaging method and introduced in the 1960’s in nuclear physics) was formulated [5] in the context of density functional theory (DFT). Applications of the DFTSCM (and of a semiempirical variant, SESCM, closer to the nuclear Strutinsky approach) to condensedmatter finite systems will be discussed, including the charging and fragmentation of metal clusters, fullerenes, and metallic nanowires [5]. The DFTSCM offers an improvement compared to the use of ThomasFermi gradient expansions for the kinetic energy density functional in the framework of orbitalfree DFT. (2) A unified description of strongly correlated phenomena in finite systems of repelling particles [whether electrons in quantum dots (QDs) or ultracold bosons in rotating traps] has been achieved through a twostep method of symmetry breaking at the unrestricted Hartree Fock (UHF) level and of subsequent symmetry restoration via post HartreeFock projection techniques [3]. The general principles of the twostep method can be traced to nuclear theory (Peierls and Yoccoz) and quantum chemistry (L ̈owdin). This method can describe a wide variety of novel strongly correlated phenomena, including: (I) Chemical bonding and dissociation in quantum dot molecules and in single elliptic QDs, with potential technological applications to solidstate quantum computing. (II) Particle localization at the vertices of concentric polygonal rings and formation of rotating (and other less symmetric) Wigner molecules in quantum dots and ultracold rotating bosonic clouds [6]. (III) At high magnetic field (electrons) or rapid rotation (neutral bosons), the method yields analytic trial wave functions in the lowest Landau level [7], which are an alternative to the fractionalquantumHalleffect (FQHE) compositefermion and JastrowLaughlin approaches. (3) The physics of planar graphene nanorings with armchair edge terminations shows analo gies with the physics described by the RQFT JackiwRebbi model and the related SuSchrieffer Heeger model of polyacetylene [4]. This part of the talk will describe the emergence of exotic states and properties, like solitons, charge fractionization, and nontrivial topological insulators, in these graphene nanosystems. [1] C. Yannouleas, R.A. Broglia, M. Brack, and P.F. Bortignon, Phys. Rev. Lett. 63, 255 (1989); [2] C. Yannouleas, U. Landman, and R.N. Barnett, in Metal Clusters, edited by W. Ekardt (JohnWiley, New York, 1999) Ch. 4, p. 145; [3] C. Yannouleas and U. Landman, Rep. Prog. Phys. 70, 2067 (2007), and references therein; [4] I. Romanovsky, C. Yannouleas, and U. Landman, Phys. Rev. B 87, 165431 (2013); Phys. Rev. B 89, 035432 (2014). [5] C. Yannouleas and U. Landman, Phys. Rev. B 48, 8376 (1993); Ch. 7 in ”Recent Advances in OrbitalFree Density Functional Theory,” Y.A. Wang and T.A. Wesolowski Eds. (Word Scientific, Singapore, 2013) p. 203 (arXiv:1004.3536); [6] C. Yannouleas and U. Landman, Phys. Rev. Lett. 82, 5325 (1999); I. Romanovsky, C. Yannouleas, and U. Landman, Phys. Rev. Lett. 97, 090401 (2006). [7] C. Yannouleas and U. Landman, Phys. Rev. A 81, 023609 (2010); Phys. Rev. B 84, 165327 (2011).
3:10 PM
Angularmomentumprojection method to approach nuclear manybody wave functions

Yang Sun
Angularmomentumprojection method to approach nuclear manybody wave functions
Yang Sun
3:10 PM  3:50 PM
Room: FP41
In performing shellmodel calculations for large nuclear systems, the central issue is how to truncate the shellmodel space efficiently. It corresponds to a proper arrangement of the configuration space to separate the most important part from the rest of the space. There are different schemes for the shellmodel truncation. Considering the fact that most nuclei in the nuclear chart are deformed, using a deformed basis supplemented by angular momentum projection is an efficient way. Shellmodel Hamiltonian is then diagonalized in the projected basis. The method is in principle independent of how a deformed basis is prepared and how an effective interaction is chosen. This approach may be viewed as to bridge the two traditional nuclear physics methods: the deformed meanfield approximation and the conventional shellmodel diagonalization, because it keeps all the advantages that a meanfield model has to incorporate important correlations, and has the properties of the conventional shellmodel that configurations are mixed beyond the meanfiled states to include effects of residual interactions. In this talk, we present the above idea by taking the Projected Shell Model and its extensions as examples [1,2,3,4]. Given the strong demand for shell model calculations also from nuclear astrophysics, one needs such an approach that contains sufficient correlations and can generate wave functions in the laboratory frame, thus allowing exact calculations for transition probabilities, spectroscopic factors, and betadecay and electroncapture rates, in heavy, deformed nuclei. This research is supported by the National Natural Science Foundation of China (No. 11135005) and by the 973 Program of China (No. 2013CB834401). [1] K. Hara, Y. Sun, Int. J. Mod. Phys. E4 (1995) 637. [2] Y. Sun and C.L. Wu, Phys. Rev. C68 (2003) 024315. [3] Y. Sun, Int. J. Mod. Phys. E15 (2006) 1695. [4] Y. Sun, Rev. Mex. Fis. S54(3) (2008) 122.
3:50 PM
Coffee break
Coffee break
3:50 PM  4:10 PM
Room: 132:028
4:10 PM
Microscopic description of nuclear reactions within Coupled Cluster and Gamow Shell Model theories

Nicolas Michel
Microscopic description of nuclear reactions within Coupled Cluster and Gamow Shell Model theories
Nicolas Michel
4:10 PM  4:50 PM
Room: FP41
Nuclei at driplines bear unique properties such as halos or resonant character at ground state level, inexistent in the valley of stability. While the latter consists of standard closed quantum systems, dripline nuclei are open quantum systems, so that models describing their properties must include both nuclear intercorrelations and continuum degrees of freedom. Coupled Cluster and Gamow Shell Model theories, in both abinitio and effective approaches, are tools of choice for that matter as nuclear correlations are present through configuration mixing while continuum degrees of freedom are imparted by the use of the Berggren basis. The latter methods, initially devised for structure calculations, can now be utilized to study reaction observables. Applications concern direct reactions on light and medium nuclei.
4:50 PM
Round table
Round table
4:50 PM  5:30 PM
Room: FP41
Tuesday, September 16, 2014
9:00 AM
Low and HighEnergy Excitations of the Unitary Fermi Gas

Joseph Carlson
Low and HighEnergy Excitations of the Unitary Fermi Gas
Joseph Carlson
9:00 AM  9:40 AM
Room: FP41
I describe the use of Quantum Monte Carlo Methods to study low and highenergy excitations of the Unitary Fermi Gas. We have employed Auxiliary Field Quantum Monte Carlo methods to study this regime of strong pairing in the inhomogeneous gas. The scale invariance of the system places strong constraints on the form of the density functional, unlike nuclear density functionals it can be described in only a very few constants. The derived functional can then be used to predict the properties of small trapped clusters, we find excellent agreement between microscopic calculations of these clusters and results predicted by the density functional. We have also studied the response of the unitary Fermi Gas at very large momentum transfer. Experimentally, the spin and density response are quite different even at very high momentum. We describe approaches to reproduce these responses and analogies to neutrino scattering in nuclei.
9:40 AM
Quantum simulation of twodimensional U(1) critical systems: A Higgs particle and the possible help of string theory for the optical conductivity

Lode Pollet
Quantum simulation of twodimensional U(1) critical systems: A Higgs particle and the possible help of string theory for the optical conductivity
Lode Pollet
9:40 AM  10:20 AM
Room: FP41
Quantum simulators are special purpose devices designed to provide physical insight in a specific quantum problem that is hard to study in the laboratory and impossible on a computer. However, before they can be used they require calibration. For cold atomic systems, quantum Monte Carlo simulations have played a key role there. They established a few years ago that the thermodynamic properties of the experimental system are in onetoone agreement with the simulations of the corresponding model. The synergy between the two approaches has dramatically progressed since then, to each other’s benefice: In the main part of this talk, I will focus on the dynamical properties of a U(1) critical system in (2+1) dimensions focusing on the existence of the amplitude mode or Higgs particle, and on the optical conductivity, which we compare against predictions from the AdS/CFT correspondence. Finally, I will discuss some open problems for this approach to quantum simulation.
10:20 AM
Coffee break
Coffee break
10:20 AM  10:40 AM
Room: 132:028
10:40 AM
Recent Developments and Applications of the AuxiliaryField Monte Carlo Method

Christopher Gilbreth
Recent Developments and Applications of the AuxiliaryField Monte Carlo Method
Christopher Gilbreth
10:40 AM  11:20 AM
Room: FP41
The auxiliaryfield Monte Carlo (AFMC) method is a powerful technique to calculate thermal and groundstate properties of strongly correlated systems. In particular, it has been extensively applied to study the properties of nuclear and atomic systems. We discuss several recent developments and applications of the method to finitesize systems. (i) In finite systems, it is often necessary to use the canonical ensemble with fixed number of particles. However, the projection on an odd number of particles leads to a new sign problem at low temperatures that has severely limited the application of AFMC to such systems. We discuss a method to circumvent the oddparticle sign problem which allows accurate determination of the groundstate energy, and present its application to the calculation of nuclear pairing gaps from oddeven mass differences [1]. (ii) The level density is among the most important statistical nuclear properties, but its calculation in the presence of correlations is a difficult manybody problem. We discuss recent AFMC calculations of level densities in heavy nuclei. In particular, we present the first microscopic calculation of the collective enhancement factors, which describe the enhancement of level densities by collective states [2]. (iii) Lowtemperature calculations require numerical stabilization of the long chains of matrix multiplications necessary to compute the propagator, and a corresponding stabilized method for particlenumber projection. The latter is computationally expensive. We discuss an improved method of stabilizing canonicalensemble calculations that exhibits better scaling and allows calculations for much larger systems [3]. (iv) Deformation is an important concept for the understanding of heavy nuclei. However, it is based on meanfield theory, which breaks rotational invariance, a cornerstone symmetry of finite nuclei. We discuss a method to analyze nuclear deformations at finite temperature using AFMC, which preserves the rotational invariance of the system [4]. In particular, we calculate the probability distribution of the quadrupole operator in heavy rareearth nuclei, and show that it carries modelindependent signatures of deformation. References: [1] A. Mukherjee and Y. Alhassid, Phys. Rev. Lett. 109, 032503 (2012). [2] C. Ozen, Y. Alhassid and H. Nakada, Phys. Rev. Lett. 110, 042502 (2013). [3] C. N. Gilbreth and Y. Alhassid, arXiv:1402.3585 (2014). [4] Y. Alhassid, C. N. Gilbreth and G. F. Bertsch, arXiv:1408.0081 (2014)
11:20 AM
Towards the entanglement of strongly coupled fermions via lattice Monte Carlo

Joaquin Drut
Towards the entanglement of strongly coupled fermions via lattice Monte Carlo
Joaquin Drut
11:20 AM  12:00 PM
Room: FP41
The calculation of the entanglement properties of strongly coupled manybody systems, in particular Renyi and von Neumann entropies, continues to be an active research area with many open questions. In this talk, I will outline the challenges and describe some of the advances, by my group and others, towards the characterization of entanglement in nonrelativistic manyfermion systems using novel lattice Monte Carlo strategies.
12:00 PM
Discussion
Discussion
12:00 PM  1:00 PM
Room: FP41
1:00 PM
Lunch
Lunch
1:00 PM  2:30 PM
Room: 132:028
2:30 PM
Pfaffians in nuclear structure theory

Luis Robledo
Pfaffians in nuclear structure theory
Luis Robledo
2:30 PM  3:10 PM
Room: FP41
In those branches of physics involving quantum many body systems, mean field states are a good starting point for any theoretical study. One of the advantages of mean field states is the existence of generalized Wick theorems that simplify the evaluation of operator overlaps. Unfortunately, the number of terms to be considered increase with the double factorial of the number of creation and annihilation operators in the overlap. This and other problems that appear when the mean field states are of the Hartree Fock Bogoliubov (HFB) type can be easily handled introducing fermion coherent state techniques and the pfaffian. In my talk I will discuss this technique and the applications involving HFB states in the context of symmetry restoration and configuration techniqes common in low energy nuclear structure calculations.
3:10 PM
Auxiliaryfield calculations with or without the sign problem:from Fermi gases to molecules to solids

Shiwei Zhang
Auxiliaryfield calculations with or without the sign problem:from Fermi gases to molecules to solids
Shiwei Zhang
3:10 PM  3:50 PM
Room: FP41
I will describe recent progress in developing a general framework for accurate groundstate calculations of interacting electronic systems. This framework is based on the use of auxiliaryfields, and addresses the sign problem (which turns into a phase problem for realistic electronelectron interactions) by constraining the imaginarytime paths with an approximate sign (gauge) condition. The approach can be used to study either a fully materialsspecific Hamiltonian or a Hubbardlike model  or indeed any electronic Hamiltonian in between as the former is ``downfolded'' to the latter. As an example of materialsspecific calculations, we determine the equation of state in a variety of solids, which systematically removes deficiencies of densityfunctional theory (DFT) results. As an example of model studies, the nature of magnetic and charge correlations in the doped Hubbard model are determined, in the context of models for hightemperature superconductivity. Its implications on the search for socalled FFLO phases with cold atoms will be discussed. We also present exact results on the properties of the twodimensional ultracold Fermi gas. Calculations in systems with strong spinorbit coupling will be discussed.
3:50 PM
Coffe break
Coffe break
3:50 PM  4:10 PM
Room: FP41
4:10 PM
The isospin and angularmomentumprojected density functional theory and beyond: formalism and applications

Wojciech Satula
The isospin and angularmomentumprojected density functional theory and beyond: formalism and applications
Wojciech Satula
4:10 PM  4:50 PM
Room: FP41
Over the last few years we have developed the multireference density functional theory (DFT) involving the isospin and angularmomentum projections of a single Slater determinant. The model, dubbed below static, was specifically designed to treat rigorously the conserved rotational symmetry and, at the same time, tackle the explicit breaking of the isospin symmetry resulting from a subtle balance between the longrange isospinsymmetrybreaking Coulomb field and shortrange isospinsymmetryconserving (predominantly) strong force. These unique features allowed us to calculate, in between, the isospin impurities in N~Z nuclei and isospin symmetry breaking corrections (ISB) to superallowed Fermi betadecay matrix elements. Recently, we have extended the model to a variant (hereafter called dynamic) that allows for mixing of states that are projected from selfconsistent Slater determinants representing lowlying (multi)particle(multi)hole excitations. The states that are mixed have good angular momentum and, at the same time, include properly treated Coulomb isospin mixing. Hence, the extended model can be considered as a variant of the no core configurationinteraction approach, with twobody shortrange (hadronic) and longrange (Coulomb) interactions treated on the same footing. It is based on a truncation scheme dictated by the selfconsistent deformed HartreeFock (HF) solutions. The model can be used to calculate spectra, transitions, and betadecay matrix elements in any nuclei, irrespective of their neutron and protonnumber parities. The aim of the talk is to introduce the theoretical frameworks of both the static and dynamic approaches and present selected applications. The applications will be focused on nuclei relevant to highprecision tests of the weakinteraction flavormixing sector of the Standard Model. In this context, we will present the results for ISB corrections to superallowed Fermi transitions and for the lowspin spectra in: 32S and 32Cl nuclei, in A=38 Ar, K, and Ca nuclei, and in 62Ga and 62Zn nuclei. In case of 62Zn the spectrum of 0+ states will be addressed. The 0+ states in this nucleus were reassigned in a recent experiment, and are now posing a challenge to theory.
4:50 PM
Round table
Round table
4:50 PM  5:30 PM
Room: FP41
Wednesday, September 17, 2014
10:00 AM
Clustering and response functions of light nuclei in explicitly correlated Gaussians

Yasuyuki Suzuki
Clustering and response functions of light nuclei in explicitly correlated Gaussians
Yasuyuki Suzuki
10:00 AM  10:40 AM
Room: FP41
Explicitly correlated Gaussian basis is used for solving fewbody problems in many fields. The basis functions are easily adaptable and flexible enough to describe complex fewbody dynamics. We obtain a unified description of different types of structure and a fair account of correlated motion of interacting particles as well as the tail of the wave function. I present some examples that show the power of the correlated Gaussians: The bound and resonant states of 4He, the electric dipole response functions of 4He and 6He, and alphaclustering in 16O in the framework of a 12C core plus four nucleon model. It is a challenge for future to extend the application of the correlated Gaussians to a study on a competition between singleparticle motion and clustering around a noninert core. Such a study will be important to evaluate the rate of the radiative capture reactions 12C(alpha, gamma)16O at low energy and to account for the lowlying spectrum of 212Po that shows the large alphadecay width and the enhanced electric dipole transitions.
10:40 AM
Superconductivity as a Universal Emergent Phenomenon in Diverse Physical Systems

Mike Guidry
Superconductivity as a Universal Emergent Phenomenon in Diverse Physical Systems
Mike Guidry
10:40 AM  11:20 AM
Room: FP41
Superconductivity and superfluidity having generically recognizabl features are observed or suspected across a strikingly broad range of physical systems: traditional BCS superconductors, cuprate high temperature superconductors, ironbased hightemperature superconductors, organic superconductors, heavyfermion superconductors, and superfluid helium3 in condensed matter, in many aspects of lowenergy nuclear structure physics, and in various exotic possibilities for gravitationally condensed objects such as neutron stars. Microscopically these systems differ fundamentally but the observed superconductivity and superfluidity exhibit two universal features: (1) They result from a condensate of fermion Cooper pairs, and (2) They represent emergent collective behavior that can have only an abstract dependence on the underlying microscopic physics. This universality can hardly be a coincidence but a unified understanding of superconductivity and superfluidity across these highly disparate fields seems impossible microscopically. A unified picture may be possible if superconductivity and superfluidity are viewed as resulting from physics that depends only on broad physical principles operating systematically at the emergent scale, with physics at the underlying microscopic scale entering only parametrically. I will give an overview of superconductivity and superfluidity found in various fermionic condensed matter, nuclear physics, and neutron star systems. I will then propose that all these phenomena result from the systematic occurrence of generic algebraic structures for the emergent effective Hamiltonian, with the underlying microscopic physics being largely irrelevant except for influencing parameter values.
11:20 AM
Coffe break
Coffe break
11:20 AM  11:40 AM
Room: f
11:40 AM
NoCore CI calculations of light nuclei: Emergence of rotational bands

Pieter Maris
NoCore CI calculations of light nuclei: Emergence of rotational bands
Pieter Maris
11:40 AM  12:20 PM
Room: f
The atomic nucleus is a selfbound system of strongly interacting nucleons. In NoCore Configuration Interaction (CI) calculations, the nuclear wavefunction is expanded in a basis of Slater Determinants of singlenucleon wavefunctions (Configurations), and the manybody Schrödinger equation becomes a large sparse matrix problem. The challenge is to reach numerical convergence to within quantifiable numerical convergence to within quantifiable numerical uncertainties for physical observables using finite truncations of the infinitedimensional basis space. I discuss the (dis)advantages of different truncation schemes, as well as strategies for constructing and solving the resulting large sparse matrices of current multicore computer architectures. Several of these strategies have been implemented in the code MFDn, a hybrid MPI/OpenMP Fortran code for abinitio nuclear structure calculations that has been demonstrated to scale to over 200,000 cores. Finally, I present results for ground state energies, excitation spectra, and select electromagnetic observables for light nuclei in the A=6 to 14 range using realistic 2 and 3body forces. In particular, I demonstrate that collective phenomena such as rotational band structures can emerge from these microscopic calculations.
12:20 PM
Discussion
Discussion
12:20 PM  1:00 PM
Room: FP41
1:00 PM
Lunch
Lunch
1:00 PM  2:30 PM
Room: Albanova Restaurant
2:30 PM
A new approach for largescale shellmodel calculations and largescale complex scaling calculations

Takahiro Mizusaki
A new approach for largescale shellmodel calculations and largescale complex scaling calculations
Takahiro Mizusaki
2:30 PM  3:10 PM
Room: FP41
In my presentation, I will present a new approach to numerically solve shell model calculations and complex scaling calculations, which have real energy eigenvalues and complex energy eigenvalues, respectively. For shell model calculations, I have already published in Ref.1 and this new approach works as well as the wellknown Lanczos method. In an application concerning to isospin breaking [2], it is superior to the Lanczos method. I will show this new approach in detail. In the latter part of my presentation, I will show an extension of this work [3] to complex scaling calculations which is useful to describe resonance states. This approach will be able to open largescale complex scaling calculations. This work is a result of collaboration with Prof. K. Kaneko, M. Honma, T. Sakurai, Y. Sun, S. Tazaki, G. de Angelis, T. Myo and K. Kato. Reference [1] T. Mizusaki, K. Kaneko, M. Honma, T. Sakurai, Phys. Rev. C82 024310 (2010). [2] T. Mizusaki, K, Kaneko, M. Honma, K. Sakurai, Acta Phsica Polonica B 42, 447 (2011). K. Kaneko, T. Mizusaki, Y. Sun, S. Tazaki, G. de Angelis, Phys. Rev. Lett. 109, 092504 (2012). [3] T.Mizusaki, T.Myo, K.Kato, to be submitted.
3:10 PM
Abinitio calculations of nuclei with manybody perturbation theory

Furong Xu
Abinitio calculations of nuclei with manybody perturbation theory
Furong Xu
3:10 PM  3:50 PM
Room: FP41
We start from a realistic nuclear force (N3LO [1] or JISP16 [2]), and use the similarity renormalization group (SRG) to renormalize the realistic nuclear force. With the softened NN force, we first perform the HartreeFock (HF) calculation, and then take the HF solution as the reference and basis for further corrections to the solution of the manybody system. The manybody perturbation theory (MBPT) [3] has been employed for the correction calculations. Corrections up to the third order in energy and up to second order in radius have been considered. As preliminary investigations, we have calculated 4He and 16O, obtaining quite good converged results in their binding energies and radii. We thank J. Vary for providing the JISP16 interaction and useful discussions. [1] D.R. Entem and R. Machleidt, Phys. Rev. C 68, 041001 (32003); [2] A.M. Shirokov, A.I. Mazur, S/A. Zaytsev, J.P. Vary and T.A. Weber, Phys. Rev. C 70, 044005 (2004); [3] I. Shavitt and R.J. Bartlett, Manybody methods in Chemistry and physics: MBPT and coupledcluster theory (2009).
3:50 PM
Coffe break
Coffe break
3:50 PM  4:10 PM
Room: FP41
4:10 PM
Neutrino physics and nuclear structure for doublebeta decay

Mihai Horoi
Neutrino physics and nuclear structure for doublebeta decay
Mihai Horoi
4:10 PM  4:50 PM
Room: FP41
Neutrinoless doublebeta decay, if observed, would signal physics beyond the Standard Model that would be discovered at energies significantly lower than those at which the relevant degrees of freedom can be excited. Therefore, it could be difficult to use the neutrinoless doublebeta decay observations to distinguish between several beyond Standard Model competing mechanisms that were propose to explain this process. Accurate nuclear structure calculations of the nuclear matrix elements (NME) necessary to analyze the decay rates could be helpful to narrow down the list of competing mechanisms, and to better identify the more exotic properties of the neutrinos. In my talk I will review the neutrino physics relevant for doublebeta decay, I will analyze the status of the shell model calculation of the NME, and their relevance for discriminating thecontribution of possible competing mechanisms to the neutrinoless doublebeta decay process. U.S. DoE grant DESC0008529 and U.S. NSF grants PHY1068217 and PHY1404442 are acknowledged.
4:50 PM
Nucleonpair Approximation of the shell model

YuMin Zhao
Nucleonpair Approximation of the shell model
YuMin Zhao
4:50 PM  5:30 PM
Room: FP41
Atomic nuclei are complex systems of protons and neutrons that strongly interact with each other via an attractive and shortrange force, leading to a pattern of dominantly monopole and quadrupole correlations between like particles (i.e., protonproton and neutronneutron correlations) in lowlying states of atomic nuclei. Among many nucleon pairs, very few nucleon pairs such as proton and neutron pairs with spin zero, two, and occasionally isoscalar protonneutron pairs with spin aligned, play a dominant role in lowenergy nuclear structure. Therefore the nucleonpair approximation provides us with an efficient truncation scheme of the full shell model configurations which are otherwise too large to handle for medium and heavy nuclei. Furthemore, the nucleonpair approximation leads to simple pictures in physics, as the dimension of nucleonpair subspace is small. In this talk I would like to give a brief review of its history, formulation, validity, applications, as well as its link to previous approaches. Numerical calculations of lowlying states for realistic atomic nuclei are demonstrated with examples. Applications of pair approximations to other problems are also discussed.
Thursday, September 18, 2014
9:00 AM
Toward modelindependent calculations of atomic nuclei

Thomas Pappenbrock
Toward modelindependent calculations of atomic nuclei
Thomas Pappenbrock
9:00 AM  9:40 AM
Room: FP41
This talk reviews recent results of coupledcluster calculations for rare isotopes, optimization of interaction from chiral effective field theory, and finite size effects in the oscillator basis.
9:40 AM
Highly Frustrated SpinLattice Models of Magnetism and Their Quantum Phase Transitions: A Microscopic Treatment via the Coupled Cluster Method

Raymond Bishop
Highly Frustrated SpinLattice Models of Magnetism and Their Quantum Phase Transitions: A Microscopic Treatment via the Coupled Cluster Method
Raymond Bishop
9:40 AM  10:20 AM
Room: FP41
The coupled cluster method [1] (CCM) is one of the most pervasive, most powerful, and most successful of all ab initio formulations of quantum manybody theory. It has probably been applied to more systems in quantum field theory, quantum chemistry, nuclear, subnuclear, condensed matter and other areas of physics than any other competing method. The CCM has yielded numerical results which are among the most accurate available for an incredibly wide range of both finite and extended physical systems defined on a spatial continuum. These range from atoms and molecules of interest in quantum chemistry, where the method has long been the recognized "gold standard", to atomic nuclei; from the electron gas to dense nuclear and baryonic matter; and from models in quantum optics, quantum electronics, and solidstate optoelectronics to field theories of strongly interacting nucleons and pions. This widespread success for both finite and extended physical systems defined on a spatial continuum [2] has led to recent applications to corresponding quantummechanical systems defined on an extended regular spatial lattice. Such lattice systems are nowadays the subject of intense theoretical study. They include many examples of systems characterized by novel ground states which display quantum order in some region of the Hamiltonian parameter space, delimited by critical values which mark the corresponding quantum phase transitions. The quantum critical phenomena often differ profoundly from their classical counterparts, and the subtle correlations present usually cannot easily be treated by standard manybody techniques (e.g., perturbation theory or meanfield approximations). A key challenge for modern quantum manybody theory has been to develop microscopic techniques capable of handling both these novel and more traditional systems. Our recent work shows that the CCM is capable of bridging this divide. We have shown how the systematic inclusion of multispin correlations for a wide variety of quantum spinlattice problems can be efficiently implemented with the CCM [3]. The method is not restricted to bipartite lattices or to nonfrustrated systems, and can thus deal with problems where most alternative techniques, e.g., exact diagonalization of small lattices or quantum Monte Carlo (QMC) simulations, are faced with specific difficulties. In this talk I describe our recent work that has applied the CCM to strongly interacting and highly frustrated spinlattice models of interest in quantum magnetism, especially in two spatial dimensions. I show how the CCM may readily be implemented to high orders in systematically improvable hierarchies of approximations, e.g., in a localized latticeanimalbased subsystem (LSUB$m$) scheme, by the use of computeralgebraic techniques. Values for groundstate (and excitedstate) properties are obtained which are fully competitive with those from other stateoftheart methods, including the much more computationally intensive QMC techniques in the relatively rare (unfrustrated) cases where the latter can be readily applied. I describe the method itself, and illustrate its ability to give accurate descriptions of the groundstate phase diagrams of a wide variety of frustrated magnetic systems via a number of topical examples of its highorder implementations, from among a very large corpus of results for spin lattices. The raw LSUB$m$ results are themselves generally excellent. I show explicitly both how they converge rapidly and can also be accurately extrapolated in the truncation index, $m \to \infty$, to the exact limit. [1] R.F. Bishop, in "Microscopic Quantum ManyBody Theories and Their Applications," (eds. J. Navarro and A. Polls), Lecture Notes in Physics Vol. 510, SpringerVerlag, Berlin (1998), 1. [2] R.F. Bishop, Theor. Chim. Acta 80 (1991), 95; R.J. Bartlett, J. Phys. Chem. 93 (1989), 1697. [3] D.J.J. Farnell and R.F. Bishop, in "Quantum Magnetism," (eds. U. Schollwöck, J. Richter, D.J.J. Farnell and R.F. Bishop), Lecture Notes in Physics Vol. 645, SpringerVerlag, Berlin (2004), 307.
10:20 AM
Coffe break
Coffe break
10:20 AM  10:40 AM
Room: FP41
10:40 AM
Openshell systems via symmetry (broken and) restored coupled cluster theory

Thomas Duguet
Openshell systems via symmetry (broken and) restored coupled cluster theory
Thomas Duguet
10:40 AM  11:20 AM
Room: f
Ab initio manybody methods have been developed over the past ten years to address closedshell nuclei up to mass $\text{A}\sim 130$ on the basis of realistic two and threenucleon interactions. A current frontier relates to the extension of those manybody methods to the description of openshell nuclei. Several routes are currently under investigation to do so among which one relies on the powerful concept of spontaneous symmetry breaking. Singly openshell nuclei can be efficiently described via the breaking of U(1) gauge symmetry associated with particlenumber conservation, as a way to account for their superfluid character. Doubly openshell nuclei can be addressed by further breaking SU(2) symmetry associated with angular momentum conservation. Still, the description of finite quantum systems eventually requires the exact restoration of symmetry quantum numbers. In this context, we discuss two recent developments performed within the frame of singlereference coupled cluster theory. First, we present the Bogoliubov coupled cluster formalism, which consists of representing the exact groundstate wave function of the system as the exponential of a quasiparticle excitation cluster operator acting on a Bogoliubov reference state. Test calculations for the pairing Hamiltonian are presented along with realistic proofofprinciple calculations of eveneven nuclei with $\text{A} \approx 20$. Second, we discuss a recent extension of symmetryunrestricted coupledcluster theory that allows for the exact restoration of the broken symmetry at any truncation order. The formalism, which encompasses both singlereference coupled cluster theory and projected HartreeFock theory as particular cases, permits the computation of usual sets of connected diagrams while consistently incorporating static correlations through the highly nonperturbative restoration of the symmetry. A key difficulty relates to the necessity to handle generalized energy {\it and} norm kernels for which naturally terminating coupledcluster expansions are indeed obtained. The focus is on SU(2) and U(1) symmetries but the formalism can be extended to any (locally) compact Lie group and to discrete groups, such as most point groups.
11:20 AM
Pairing and quarteting in protonneutron systems

Nicolae Sandulescu
Pairing and quarteting in protonneutron systems
Nicolae Sandulescu
11:20 AM  12:00 PM
Room: FP41
The common treatment of protonneutron pairing in N ≅ Z nuclei relies on Cooper pairs and meanfield BCStype models. However, the nuclear interaction can induce, through the isospin conservation, quartet correlations of alpha type which might compete with the Cooper pairs. In fact, for any isovector pairing interactions the ground state of N=Z systems is accurately described not by Cooper pairs but in terms of collective quartets [1,2]. Cooper pairs and quartets can however coexist in isospin asymmetric systems with N>Z. In this case the ground state of the isovector pairing Hamiltonian can be described with high precision as a condensate of alphalike quartets to which it is appended a condensate of Cooper pairs built with the excess neutrons [3,4]. Quartets appear to be the relevant degrees of freedom for treating not only the isovector pairing but also the competition between the isoscalar and the isovector protonneutron pairing in N=Z nuclei [5]. These facts indicate that the manybody pairing problem in N ≅ Z nuclei can be more efficiently treated in calculation schemes based on alphatype quartets rather than on Cooper pairs and BCStype models. 1.N. Sandulescu, D. Negrea, J. Dukelski, C. W. Johnson, Phys. Rev. C85, 061303 (R) (2012); 2. N. Sandulescu, D. Negrea, C. W. Johnson, Phys. Rev. C86, 041302 (R) (2012); 3. M. Sambataro and N. Sandulescu, Phys Rev. C88, 061303 (R)(2013) ; 4. D. Negrea and N. Sandulescu, Phys. Rev. C (2014), in press; 5. M. Sambataro, N. Sandulescu and C. W. Johnson, in preparation
12:00 PM
Discussion
Discussion
12:00 PM  1:00 PM
Room: FP41
1:00 PM
Lunch
Lunch
1:00 PM  3:00 PM
Room: Albanova Restaurant
3:00 PM
Nuclear physics: a laboratory for manyparticle quantum mechanics (Colloquium)

George Bertsch
Nuclear physics: a laboratory for manyparticle quantum mechanics (Colloquium)
George Bertsch
3:00 PM  4:00 PM
Room: Oskar Klein room
Nuclear structure physics has presented a fruitful testing ground for quantum manybody theory since its beginnings half a century ago. On the one hand, the observed phenomena have given rise to models that have been invaluable to interpret the underlying physics. On the other hand, the quest to make a predictive theory has given strong impetus to developing computational tools to solve the manyparticle Schroedinger equation. I will review some of these theoretical highlights in nuclear structure, ranging from the modeling and computation of fewbody systems to the manyparticle finite systems represented by our heavy nuclei. Among the models I discuss are the unitarylimit fermionic Hamiltonian, the Nilsson model of nuclear deformations, and the RichardsonGaudin model of pairing. Computational strategies that have been very successful in different contexts are the MonteCarlo methods, the multiconfiguration shell model, and the extensions of meanfield theory to restore broken symmetries.
Friday, September 19, 2014
9:00 AM
Quantum tensor networks for simulating quantum spin systems

Frank Verstraete
Quantum tensor networks for simulating quantum spin systems
Frank Verstraete
9:00 AM  9:40 AM
Room: FP41
9:40 AM
Tensor methods and entanglement measurements for models with longrange interactions

Örs Legeza
Tensor methods and entanglement measurements for models with longrange interactions
Örs Legeza
9:40 AM  10:20 AM
Room: FP41
Strongly correlated materials are typically rather difficult to treat theoretically. They have a complicated band structure, and it is quite difficult to determine which minimal model correctly describes their essential physical properties. Moreover, the value of the model parameters to be used for a given material is often the subject of debate. Unfortunately, analytic approaches often do not provide rigorous conclusions for the interesting parameter sets, therefore, numerical simulations are mandatory. Momentumspace formulations of local models such as the Hubbard model and problems in quantum chemistry are especially hard to treat using matrix and tensor productbased algorithms because they contain nonlocal interactions. Quantum entropybased measures can be used to map the entanglement structure in order to gain physical information and to optimize algorithms. In this tutorial contribution, we present an overview of the real space, momentum space and quantum chemistry versions of the DMRG/MPS and treeTNS algorithms and their applications to various spin and fermionic lattice models, and to transition metal complexes. Data sparse representation of the wavefunction will be investigated through advances in entanglement localization providing optimized tensor topologies. Entropy generation by the RG procedure, the mutual information leading to a multiply connected network of lattice sites or orbitals, and reduction of entanglement by basis transformation will be discussed. Inclusion of the concepts of entanglement will be used to identify the wave vector of soft modes in critical models, to determine highly correlated molecular orbitals leading to an efficient construction of active spaces and for characterizing the various types of correlation effects relevant for chemical bonding. The state of the art matrixproductbased algorithms is demonstrated on polydiacetylene chains by reproducing experimentally measured quantities with high accuracy. [1] S. R. White, Phys. Rev. Lett. 69, 28632866 (1992). [2] S. R. White and R. L. Martin, J. Chem. Phys. 110, 41274130 (1999). [3] O. Legeza, R. M. Noack, J. SĂłlyom, and L. Tincani, in Computational ManyParticle Physics, eds. H. Fehske, R. Schneider, and A. Weisse 739, 653664 (2008). [4] K. H. Marti and M. Reiher, Z. Phys. Chem. 224, 583599 (2010). [5] G. K.L. Chan and S. Sharma, Annu. Rev. Phys. Chem. 62, 465481 (2011). [6] O. Legeza and J. SĂłlyom, Phys. Rev. B 68, 195116 (2003), ibid Phys Rev. B 70, 205118 (2004). [7] J. Rissler, R.M.Noack, and S.R. White, Chemical Physics, 323, 519 (2006). [8] K. Boguslawski, P. Tecmer, O. Legeza, and M. Reiher, J. Phys. Chem. Lett. 3, 31293135 (2012). [9] K. Boguslawski, P. Tecmer, G. Barcza, O. Legeza, and M. Reiher, J. Chem. Theory Comp. (2013). [10] F. Verstraete, J.I. Cirac, V. Murg, Adv. Phys. 57 (2), 143 (2008). [11] V. Murg, F. Verstraete, O. Legeza, and R. M. Noack, Phys. Rev. B 82, 205105 (2010). [12] V. Murg, F. Verstraete, R. Schneider, P. Nagy and O. Legeza, arxiv:1403.0981 (2014). [13] G. Barcza, O. Legeza, K. H. Marti, and M. Reiher, Phys. Rev. A 83, 012508 (2011). [14] G. Barcza, R. M. Noack, J. SĂłlyom, O. Legeza, arxiv:1406.6643 (2014)
10:20 AM
Coffe break
Coffe break
10:20 AM  10:40 AM
Room: FP41
10:40 AM
Integrable RichardsonGaudin bases for pairing Hamiltonians

Stijn De Baerdemacker
Integrable RichardsonGaudin bases for pairing Hamiltonians
Stijn De Baerdemacker
10:40 AM  11:20 AM
Room: FP41
Configuration interaction methods for quantum manybody systems are generally represented within Fock space, the space spanned by all possible singleparticle Slater determinant (SD) wave functions. For stronglycorrelated quantum systems, the number of physically important SD basis states quickly reaches beyond the capacities of present (and future) computer hardware, due to the lack of correlations within these SD basis states. Bases spanned by RichardsonGaudin (RG) eigenstates can be regarded as a generalisation of Fock space, because the strong correlations are inherently present within the basis states. In this contribution, it will be shown how configuration interaction methods can benefit from the use of RG bases over conventional Fock space.
11:20 AM
Disorder in bilayer and double layer graphene

David Abergel
Disorder in bilayer and double layer graphene
David Abergel
11:20 AM  12:00 PM
Room: FP41
We use a numerical application of ThomasFermi theory to describe the effects of fluctuations in the local charge density caused by charged impurities in bilayer and double layer graphene. In the bilayer, we show that the interplay between the nonlinear screening of the disorder potential and a band gap causes the electron liquid to break into coexisting compressible and incompressible regions. For double layer graphene, we demonstrate that charged impurity disorder has a significant negative impact on the existence of theproposed excitonic condensate.
12:00 PM
Discussion
Discussion
12:00 PM  1:00 PM
Room: FP41
1:00 PM
Lunch
Lunch
1:00 PM  2:30 PM
Room: Albanova Restaurant
2:30 PM
Aspects of timedependence in manybody systems

Daniela Pfannkuche
Aspects of timedependence in manybody systems
Daniela Pfannkuche
2:30 PM  3:10 PM
Room: FP41
Dynamical processes set yet another degree of complexity to the manybody problem. With the advent of ultrafast measuring techniques modern experiments often leave the regime of adiabaticity or linear response. The evolution of quantum systems on short time scales subject to strong disturbances then becomes relevant. In this contribution, I will present two different examples that demonstrate aspects of nonequilibrium dynamics in manybody quantum systems. The first example considers the temporal evolution of a closed manybodysystem represented by a simple molecule being exposed to a strong ionizing light pulse. Solving the timedependent Schrödinger equation reveals different processes in the charge dynamics following ionization. It will be demonstrated that a proper choice of electronhole excitations is crucial for capturing the essential physics. The second example features the nonequilibrium dynamics of an open quantum system. The spin of a magnetic adatom residing on the surface of a nonmagnetic substrate is exposed to the tunneling current of a scanning tunneling microscope. Spin torque of the tunneling electrons induces spindynamics of the surface spin. A masterequation approach is used to solve vonNeumann's equation of motion for the reduced density matrix of the surface spin. Challenges in computing the short time dynamics of the system by different methods are being exhibited.
3:10 PM
Path integral simulations of bosons with disorder

Mats Wallin
Path integral simulations of bosons with disorder
Mats Wallin
3:10 PM  3:50 PM
Room: FP41
Monte Carlo simulation of worldlines of quantum particles in a path integral representation is a powerful tool mainly used for studying boson systems. Such approaches have been used to investigate properties of superfluid helium in confined geometries and localization of bosons in a random disorder potential. In particular we are interested in the role of correlations of the disorder distribution. I will introduce theoretical tools and techniques and discuss opportunities, difficulties and challenges in this field.
3:50 PM
Coffe break
Coffe break
3:50 PM  4:10 PM
Room: FP41
4:10 PM
Summary

Yoram Alhassid
Summary
Yoram Alhassid
4:10 PM  4:50 PM
Room: FP41
Saturday, September 20, 2014
12:00 PM
Boattrip with lunch
Boattrip with lunch
12:00 PM  3:00 PM
Room: Strandvägen,berth (kajplats) 16
We take a boat through the many islands in the Stockholm Archipelago. The final destination is the beautiful village of Vaxholm, which is the only town in the inner Stockholm archipelago and therefore known as its capital. Lunch will be served during the trip.
Sunday, September 21, 2014
Monday, September 22, 2014
9:30 AM
Welcome address

Alexander Balatsky
Ramon Wyss
Welcome address
Alexander Balatsky
Ramon Wyss
9:30 AM  9:45 AM
Room: 132:028
Alexander Balatsky is one of the four Professors at Nordita. He is in Condensed Matter Physics.  Ramon Wyss is Professor at the Royal Institute of Technology (KTH) and Vice President of International Affairs there.
9:45 AM
Morning Session: BSCBEC

Giancarlo CalvaneseStrinati
Morning Session: BSCBEC
Giancarlo CalvaneseStrinati
9:45 AM  11:45 AM
Room: 132:028
Temperature dependence of the pair coherence and healing lengths for a fermionic superfluid throughout the BCSBEC crossover The pair correlation function and the order parameter correlation function probe, respectively, the intrapair and interpair correlations of a Fermi gas with attractive interparticle interaction. Here, these correlation functions are calculated in terms of a diagrammatic approach, as a function of coupling throughout the BCSBEC crossover and of temperature, both in the superfluid and normal phase across the critical temperature $T_{c}$. Several physical quantities are obtained from this calculation, including the pair coherence and healing lengths, the Tan's contact, the crossover temperature $T^{*}$ below which interpair correlations begin to build up in the normal phase, and the signature for the disappearance of the underlying Fermi surface which tends to survive in spite of pairing correlations. A connection is also established with experimental data on the temperature dependence of the normal coherence length as extracted from the proximity effect measured in hightemperature (cuprate) superconductors.
2:30 PM
Afternoon Session: Metallic grains

Yoram Alhassid
Afternoon Session: Metallic grains
Yoram Alhassid
2:30 PM  4:30 PM
Room: 132:028
Chair: Alexander Balatsky
Tuesday, September 23, 2014
9:30 AM
Morning Session: Density Functional Theories: Formalism and Applications

ShanGui Zhou
Morning Session: Density Functional Theories: Formalism and Applications
ShanGui Zhou
9:30 AM  11:30 AM
Room: 132:028
MultiDimensionally Constrained Covariant Density Functional Theories: Formalism and Applications Many different shape degrees of freedom play crucial roles in determining the nuclear ground state and saddle point properties and the fission path. For the study of nuclear potential energy surfaces, it is desirable to have microscopic and selfconsistent models in which all known important shape degrees of freedom are included. By breaking both the axial and the spatial reflection symmetries simultaneously, we develop multidimensionally constrained covariant density functional theories (MDCCDFTs) [13]. The nuclear shape is assumed to be invariant under the reversion of x and y axes, i.e., the intrinsic symmetry group is V_4 and all shape degrees of freedom \beta_{\lambda\mu} with even \mu, such as \beta_{20}, \beta_{22}, \beta_{30}, \beta_{32}, \beta_{40}, ..., are included selfconsistently. The singleparticle wave functions are expanded in an axially deformed harmonic oscillator (ADHO) basis. The functional can be one of the following four forms: the meson exchange or pointcoupling nucleon interactions combined with the nonlinear or densitydependent couplings. The pairing effects are taken into account with either the BCS approach in MDC relativistic mean field (MDCRMF) models [1,2] or the Bogoliubov transformation in MDC relativistic HartreeBogoliubov (MDCRHB) models [3]. In this talk I will present the formalism of the MDCCDFT's and the applications to the study of fission barriers and third minima in potential energy surfaces of actinide nuclei [1,2,4], the Y_{32} correlations in N=150 isotones and Zr isotopes [5,6], and shape of hypernuclei [7,8]. [1] B. N. Lu, E. G. Zhao, and S. G. Zhou, Phys. Rev. C85 (2012) 011301(R). [2] B. N. Lu, J. Zhao, E. G. Zhao, and S. G. Zhou, Phys. Rev. C89 (2014) 014323. [3] B. N. Lu, et al., in preparation. [4] J. Zhao, B. N. Lu, E. G. Zhao, and S. G. Zhou, Phys. Rev. C86 (2012) 057304. [5] J. Zhao, B. N. Lu, D. Vretenar, E. G. Zhao, and S. G. Zhou, arXiv:1404.5466 [nuclth]. [6] J. Zhao, et al., in preparation. [7] B. N. Lu, E. G. Zhao, and S. G. Zhou, Phys. Rev. C84 (2011) 014328. [8] B. N. Lu, E. Hiyama, H. Sagawa, and S. G. Zhou, Phys. Rev. C84 (2014) 044307. Density Functional Theories: Formalism and Applications
2:30 PM
Afternoon Session: Modern approaches to nuclear structure

Toshio Suzuki
Andrea Idini
Afternoon Session: Modern approaches to nuclear structure
Toshio Suzuki
Andrea Idini
2:30 PM  4:30 PM
Room: 132:028
T. Suzuki Nuclear shell structure, nuclear forces and nuclear weak processes Shellmodel study of spin modes in nuclei have been done with new shellmodel Hamiltonians which have proper tensor components, and applied to nuclear weak processes at stellar environments. Roles of nuclear forces, especially the tensor and threebody interactions, on nuclear structure and shell evolutions are investigated. New shellmodel Hamiltonians for pshell (SFO [1]) and pfshell (GXPF1[2]) and VMU (monopolebased universal interaction) [3], are found to describe spindependent modes in nuclei very well such as GamowTeller (GT) strength in 12C [1], 40Ar [4], 56Fe and 56Ni [5] and magnetic moments of pshell nuclei [1,6], as well as shell evolutions toward driplines [3,7]. We discuss some of the following topics on nuclear weak processes at stellar environments with the use of the new transition strengths: (1) New neutrinonucleus reaction cross sections on light nuclei are used to study lightelement nucleosynthesis in supernova explosions [8], and the production yield ratio for 11B/7LI is pointed out to be useful to determine the neutrinomass hierarchy [9]. (2) New neutrinoinduced cross sections are obtained for 13C [10] and 40Ar [4], which are useful targets for detection of solar and supernova neutrinos. (3) New electroncapture rates in Ni isotopes [11] are obtained with GXPF1 and implications on element synthesis are studied. (4) Ecapture and betadecay rates in sdshell are used to study nuclear URCA processes in ONeMg core stars [12]. Roles of the threebody forces, especially the FujitaMiyazawa force, on proper shell evolutions of neutronrich isotopes [13], as well as on the closedshell nature of 48Ca and M1 transition in 48Ca are also studied on top of the twobody Gmatrix obtained by including corepolarization effects in larger spaces. 1. T. Suzuki, R. Fujimoto and T. Otsuka, Phys. Rev. C 67, 044302 (2003). 2. M. Honma et al., Phys. Rev. C 65, 061301(R) (2002); 69, 034335 (2004). 3. T. Otsuka, T. Suzuki, H. Honma, Y. Utsuno, N. Tsunoda, K. Tsukiyama and M. HjorthJensen, Phys. Rev. Lett. 104, 012501 (2010). 4. T. Suzuki and M. Honma, Phys. Rev. C 87, 014607 (2013). 5. T. Suzuki et al., Phys. Rev. C 79, 061603 (2009). 6. C. Yuan, T. Suzuki, T. Otsuka, F. Xu and N. Tsunoda, Phys. Rev. C 85, 064324 (2012). 7. T. Otsuka, T. Suzuki, R. Fujimoto, H. Grawe, and Y. Akaishi, Phys. Rev. Lett. 95, 232502 (2005). 8. T. Suzuki et al., Phys. Rev. C 74, 034307 (2006). 9. T. Suzuki and T. Kajino, J. Phys. G: Nucl. Part. Phys. 40, 083101 (2013). 10. T. Suzuki, A. B. Balantekin and T. Kajino, Phys. Rev. C 86, 015502 (2012). 11. T. Suzuki, M. Honma, H. Mao, T. Otsuka and T. Kajino, Phys. Rev. C 83, 044619 (2011). 12. H. Toki, T. Suzuk, K. Nomoto, S. Jones and R. Hirschi, Phys. Rev. C 88, 015806 (2013); S. Jones et al., Astrophys. J. 772, 150 (2913). 13. T. Otsuka, T. Suzuki, J. D. Holt, A. Schwenk, and Y. Akaishi, Phys. Rev. Lett.105, 032501 (2010); J. D. Holt, T. Otsuka, A. Schwenk and T. Suzuki, J. Phys. G 39, 085111 (2012).  A. Idini Nuclear Field Theory, Shell Model, Nuclear Reactions and Nuclear Astrophysics Mean field, independent particles, picture is the starting point of our understanding of the nuclear manybody system. Many development across those lines in terms of treatment and effecting interaction, culminating in the last EDF efforts, enable us to study globally, across the whole nuclear chart, the bulk properties of nuclei. However including more complex nuclear correlations, is customary to exploit the richness of nuclear structure in the related fields of nuclear reactions and astrophysics shedding light on specific, important cases and open problems like the origin of pairing in nuclei or the importance of forbidden decays in astrophysical processes. This can be achieved in terms of including correlation starting from a mean field, and then considering the interweaving of collective and single particle degrees of freedom (Nuclear Field Theory), which gives a reasonable estimate over several type of nuclear structure observables, remarking the dual origin of nuclear pairing and enabling a quantitative account of direct nuclear reaction's absolute cross sections. From another point of view, considering the contributions of the possible configurations, effectively interacting in a defined valence space (Shell Model), gives a precise estimate of ground and lowlying states. This is of outmost importance in order to estimate quantities related to beta decay and electron capture, key in several astrophysical process, thus providing important insight to nuclear astrophysics. * A. Idini et al., Dual Origin of Pairing in Nuclei, http://arxiv.org/abs/1404.7365 * G. Potel et al., Cooper pair transfer in nuclei, RPP 76, 106301. http://iopscience.iop.org/00344885/76/10/106301 * A. Idini et al., Quasiparticle renormalization and pairing correlations in spherical superfluid nuclei, PRC 85, 014331. http://journals.aps.org/prc/abstract/10.110 /PhysRevC.85.014331
Wednesday, September 24, 2014
9:30 AM
Morning session: Coupled Clusters

Gustavo Scuseria
Morning session: Coupled Clusters
Gustavo Scuseria
9:30 AM  11:30 AM
Room: 132:028
Unconventional Coupled Cluster Theories for Strong and Weak Correlations Coupled cluster (CC) theory with single and double excitations accurately describes weak electron correlation but is known to fail in cases of strong static correlation. Fascinatingly, however, pair coupled cluster doubles (pCCD), a simplified version of the theory limited to pair excitations that preserve the seniority of the reference determinant (i.e., the number of unpaired electrons) has mean field computational cost and is an excellent approximation to the full configuration interaction (FCI) of the paired space provided that the orbital basis is optimized to adequately define a pairing scheme. In previous work [1], we have shown that optimization of the pairing scheme in the seniority zero FCI leads to a very accurate description of static correlation. The same conclusion extends to pCCD [2] if the orbitals are optimized to make the pCCD energy stationary [3]. The extension of this pair model to quasiparticles will be addressed [4]. We additionally discuss renormalized Hamiltonians via similarity transformation based on Gutzwiller projectors and other exponential forms to describe residual weak correlations [5]. [1] Seniority and orbital symmetry as tools for establishing a full configuration interaction hierarchy, L. Bytautas, T. M. Henderson, C. A. JimenezHoyos, J. K. Ellis, and G. E. Scuseria, J. Chem. Phys. 135, 044119 (2011). [2] Seniority zero pair coupled cluster doubles theory, T. Stein, T. M. Henderson, and G. E. Scuseria, J. Chem. Phys. 140, 214113 (2014). [3] The optimization of molecular orbitals for coupled cluster wavefunctions, G. E. Scuseria and H. F. Schaefer, Chem. Phys. Lett. 142, 354 (1987). [4] Quasiparticle coupled cluster theory for pairing interactions, T. M. Henderson, G. E. Scuseria, J. Dukelsky, A. Signoracci, and T. Duguet, Phys. Rev. C 89, 054305 (2014). [5] Noncompact similarity transformed Hamiltonians for lattice models, J. WahlenStrothman, C. A. JimenezHoyos, T. M. Henderson, and G. E. Scuseria, in preparation.
2:30 PM
Afternoon Session: Coupled Cluster Methods

Piotr Piecuch
Afternoon Session: Coupled Cluster Methods
Piotr Piecuch
2:30 PM  4:30 PM
Room: 132:028
SINGLEREFERENCE COUPLEDCLUSTER METHODS FOR MULTIREFERENCE MOLECULAR PROBLEMS Piotr Piecuch, Jun Shen, Nicholas P. Bauman, and Jared A. Hansen Accurate modeling of chemical reactions and photochemistry requires a balanced treatment of dynamical and nondynamical manyelectron correlation effects. The popular singlereference coupledcluster (CC) and equationofmotion CC (EOMCC) methods, such as CCSD(T) and EOMCCSD, capture the former effects very effectively, but have difficulties with the latter ones, whereas multireference CC theories that are supposed to capture both types of correlations continue facing unresolved problems. This talk will discuss pragmatic ways of addressing this situation via the completely renormalized and activespace CC and EOMCC theories, and their recent merger via the novel CC(P;Q) formalism, which reproduces the nearly exact relative and total electronic energies in ground and excited states at the small fractions of computer costs of other methods that aim at similar accuracies. The development of the singly and doubly ionized and electronattached variants of the activespace EOMCC methodology, which provide an excellent description of electronic excitations in radicals, biradicals, and other similar openshell systems around closed shells at the low computational costs compared to the parent approaches, will be addressed, too.
Thursday, September 25, 2014
9:30 AM
Morning Session: Variational Theories in Quantum Chemistry

Paul Ayers
Morning Session: Variational Theories in Quantum Chemistry
Paul Ayers
9:30 AM  11:30 AM
Room: 132:028
Chair: Jorge Dukelsky
2:30 PM
Afternoon Session: Coupled Cluster Theories

Thomas Duguet
Afternoon Session: Coupled Cluster Theories
Thomas Duguet
2:30 PM  4:30 PM
Room: 132:028
Chair: Gustavo Scuseria
Friday, September 26, 2014
9:30 AM
Computational challenges in modern nuclear physics

Luis Robledo
ZaoChun Gao
Computational challenges in modern nuclear physics
Luis Robledo
ZaoChun Gao
9:30 AM  11:30 AM
Room: 132:028
Luis Robledo Computational challenges in nuclear EDF calculations.  ZaoChun Gao Overlaps and matrix elements of physical operators between arbitrary HFB states. Beyond mean field methods have been widely used in various manybody quantum systems. However, there still are some problems to be solved in the implementation of beyond mean field calculations. Especially for systems with large number of particles, such as heavy nuclei, the efficiency of beyond mean field calculations becomes a very serious problem. Recently, we have tried to figure out a convenient way of calculating the overlap between arbitrary HFB vacua [1]. We also found some compact formulae for the matrix elements of physical operators (e.g. Hamiltonian) between arbitrary HFB multiquasiparticle states [2]. These formulae may reduce the computational time by several orders of magnitude when applied to manybody quantum system in a large Fock space. [1] ZaoChun Gao, QingLi Hu, Y. S. Chen Physics Letters B 732 (2014)360. [2] QingLi Hu, ZaoChun Gao, Y. S. Chen Physics Letters B 734 (2014)162.
2:30 PM
Pairing Theory of the Wigner energy

Kai Neergaard
Pairing Theory of the Wigner energy
Kai Neergaard
2:30 PM  4:30 PM
Room: 132:028
In 1936, Bethe and Bacher suggested that when the Coulomb energy is neglected, the masses of nuclei with given mass number A=N+Z, where N and Z are the numbers of neutrons and protons, rise from N=Z approximately quadratically in NZ. Myers and Swiatecki found in 1966 a marked deviation from this rule; for small NZ the mass rises more rapidly. They called the resulting apparent extra binding energy in the vicinity of N=Z the Wigner energy. It will be shown that this nonanalytic behaviour of the mass as a function of NZ arises naturally when the pairing force is taken into account beyond a mean field approximation. In the limit of an equidistant single nucleon spectrum, the symmetry energy, that is, the increment of the mass from N=Z in the absence of the Coulomb energy, is proportional to T(T+1), where T is the isospin, in the ground state of a doubly even nucleus equal to NZ/2. This expression is similar to the one which describes the spectrum of a quantal, axially symmetric rotor, and Frauendorf and Scheikh identified in 1999 the deformation which gives rise to an analogous rotation in isospace as the superfluid pair gap. Large shell corrections modify this bulk behaviour. In recent work by Bentley and Frauendorf, partly in collaboration with the speaker, various approaches to the treatment of these shell corrections are considered. In one approach the pairing force is diagonalised exactly in a small valence space. More recently, the usual pairing correction of the NilssonStrutinsky theory is supplemented with a term derived from the Random Phase Approximation. The resulting theory reproduces quite well the empirical masses in the vicinity of N=Z for A not less than 24. A very recent generalisation of the method, which allows its application throughout the chart of nuclides and also on top of a formalism of the HartreeFock type, will be discussed.
Saturday, September 27, 2014
Sunday, September 28, 2014
Monday, September 29, 2014
9:30 AM
Morning Session: Dynamics of Quantum Open Systems

Vidar Gudmundsson
Morning Session: Dynamics of Quantum Open Systems
Vidar Gudmundsson
9:30 AM  11:30 AM
Room: 132:028
Chair: Jonas Larson
2:30 PM
Afternoon Session: Odd frequency pairing in hybrid structures and multiband superconductors

Alexander Balatsky
Afternoon Session: Odd frequency pairing in hybrid structures and multiband superconductors
Alexander Balatsky
2:30 PM  3:10 PM
Room: 132:028
Odd frequency superconductivity proved to be an elusive state that is yet to be observed as a primary pairing state. On the other hand the list of systems and structures where odd frequency can be present as an induced component is growing. I will review various scenarios pointing to emergence of odd frequency pairing due to modifications of the primary conventional pairing. Recently we find that odd frequency component is ubiquitously present in multiband superconductors. We show that oddfrequency superconducting pairing requires only a finite band hybridization, or scattering, and nonidentical intraband order parameters, of which only one band needs to be superconducting. From a symmetry analysis we establish a complete reciprocity between parity in bandindex and frequency. I will also discuss extensions of the odd frequency superconductivity to the spin and boson systems.
3:30 PM
Afternoon Session: Signature of the FFLO phase in the collective mode spectrum of ultracold Fermi gases

Jonathan Edge
Afternoon Session: Signature of the FFLO phase in the collective mode spectrum of ultracold Fermi gases
Jonathan Edge
3:30 PM  4:30 PM
Room: 132:028
We study theoretically the collective modes of a twocomponent Fermi gas with attractive interactions in a quasionedimensional harmonic trap. We focus on an imbalanced gas in the FuldeFerrellLarkinOvchinnikov (FFLO) phase. Using a meanfield theory, we study the response of the ground state to timedependent potentials. For potentials with short wavelengths, we find dramatic signatures in the largescale response of the gas which are characteristic of the FFLO phase. This response provides an effective way to detect the FFLO state in experiments.
Tuesday, September 30, 2014
9:30 AM
Morning Session: Alpha Condensates. Alphadecay: a computational challenge

Peter Schuck
Doru Sabin Delion
Morning Session: Alpha Condensates. Alphadecay: a computational challenge
Peter Schuck
Doru Sabin Delion
9:30 AM  11:30 AM
Room: 132:028
Alphadecay: a computational challenge D.S. Delion, R.J. Liotta, and A. Dumitrescu The microscopic description of alpha decay widths is an old but still challenging issue. The standard mean field plus residual interaction is not able to reproduce the absolute value of the decay width. We propose two ways to cure this defficiency, namely by introducing a new single particle diagonalization basis with two harmonic oscillator parameters [1] and by increasing protonneutron correlations through a surface cluster component in addition to the standard nuclear the mean field [2]. We describe alpha decay fine structure by using a common approach for spherical, transitional and deformed nuclei [3]. The investigation of the alpha decay fine structure is a powerfull tool to probe nuclear structure. We use projected coherent states to describe the structure of daugher nuclei and a quadrupolequadrupole alphacore interaction for alpha transitions to excited states. It turns out that the strength of this interaction, reproducing alpha transitions to 2+ states, is proportional to the clustering probability. Predictions for electromagnetic and alpha transitions to excited state are made for all available eveneven emitters. The coupled channel analysis for alpha transitions in odd mass nuclei is proposed as a promising tool to investigate nuclear structure, by the using both spectroscopic and alpha decay data. This work was supported by the strategic grant POSDRU/159/1.5/S/137750 and by the grant PNIIIDPCE201130092 of the Romanian ANCS. [1] D.S. Delion, A. Insolia, R.J. Liotta, Physical Review C 54, 292 (1996). [2] D.S. Delion, R.J. Liotta, Physical Review C 87, 024309 (2013). [3] D.S. Delion, A. Dumitrescu, Physical Review C 87, 041302(R) (2013).
2:30 PM
Afternoon Session: NeutronNucleus Interactions at Low Energies

Jouni Suhonen
Afternoon Session: NeutronNucleus Interactions at Low Energies
Jouni Suhonen
2:30 PM  4:30 PM
Room: 132:028
7:30 PM
Program Dinner
Program Dinner
7:30 PM  10:30 PM
Room: Berns Bistro and Bar, Berzelii Park, Näckströmsgatan 8
Wednesday, October 1, 2014
9:30 AM
Morning Session: Improving measurement precision with Weak Measurements

Yaron Kedem
Morning Session: Improving measurement precision with Weak Measurements
Yaron Kedem
9:30 AM  11:30 AM
Room: 132:028
The weak measurement protocol, introduced by Aharonov, Albert and Vaidman 25 years ago, is now in widespread use. They showed that weak coupling of a measurement device to a quantum system, together with a postselection, can yield an intriguing quantity which was named The Weak Value. In some contexts an observable on the system can be replaced by its Weak Value, even though it can be much larger than any of its eigenvalues and is also complex in general. The method of weak measurements have been shown to be highly useful both for the analysis of fundamental issues in quantum mechanics and for practical applications such as precision improvement. We will start with a review of the formalism and then discuss a recent development regarding the enhancement of the Signal to Noise Ratio for precision measurements in the presence of technical noise. We will see that when imaginary weak values are used, such a noise can improve the precision. Reference: Y. Kedem, Phys. Rev. A 85, 060102 (R) (2012)
2:30 PM
Afternoon Session: Explosive Nucleosynthesis of heavy elements

Gabriel Martinez Pinedo
Afternoon Session: Explosive Nucleosynthesis of heavy elements
Gabriel Martinez Pinedo
2:30 PM  4:30 PM
Room: 132:028
Thursday, October 2, 2014
9:30 AM
Morning Session: Quantum Optics

Jonas Larson
Morning Session: Quantum Optics
Jonas Larson
9:30 AM  11:30 AM
Room: 132:028
Chair: Jorge Dukelsky
3:00 PM
AlbaNova Colloquium: From Materials to Cosmology; Studying the Early Universe Under the Microscope

Nicola Spaldin
AlbaNova Colloquium: From Materials to Cosmology; Studying the Early Universe Under the Microscope
Nicola Spaldin
3:00 PM  4:00 PM
Room: Oskar Kelin Auditorium, AlbaNova Main Building
Friday, October 3, 2014
9:30 AM
Morning Session: Approximate and exact Boltzmann machine learning for the US stock market

Stanislav Borysov
Morning Session: Approximate and exact Boltzmann machine learning for the US stock market
Stanislav Borysov
9:30 AM  11:30 AM
Room: 132:028
2:30 PM
Afternoon Session: Mean field approaches

Jie Meng
Afternoon Session: Mean field approaches
Jie Meng
2:30 PM  4:30 PM
Room: 132:028
Saturday, October 4, 2014
Sunday, October 5, 2014
Monday, October 6, 2014
9:30 AM
Morning Session: Ab initio nuclear structure from lattice effective field theory

Dean Lee
Morning Session: Ab initio nuclear structure from lattice effective field theory
Dean Lee
9:30 AM  11:30 AM
Room: 132:028
I discuss recent results obtained using lattice effective field theory to probe nuclear structure. In particular I present recent lattice calculations of the Hoyle state of carbon12 and whether or not light quark masses must be finetuned for the viability of carbonbased life.
2:30 PM
Afternoon Session: Exotic nuclei. Bosonic embedded gaussian ensembles

Jason Holt
Hugo Adrian Ortega
Afternoon Session: Exotic nuclei. Bosonic embedded gaussian ensembles
Jason Holt
Hugo Adrian Ortega
2:30 PM  4:30 PM
Room: 132:028
Jason Holt Nuclear forces and exotic nuclei. Within the context of valencespace Hamiltonians derived from different ab initio manybody methods, I will discuss the importance of 3N forces in understanding and making new discoveries in two of the most exciting regions of the nuclear chart: exotic oxygen and calcium isotopes. Beginning in oxygen, we find that the effects of 3N forces are decisive in explaining why 24O is the last bound oxygen isotope [1,2]. Furthermore, 3N forces play a key role in reproducing spectra, including signatures of doubly magic 22,24O, as well as properties of isotopes beyond the dripline. The calcium isotopes, with potentially three new magic numbers beyond the standard N=20,28, present a unique laboratory to study the evolution of shell structure in mediummass nuclei. From the viewpoint of twoneutron separation energies and spectroscopic signatures of doublymagic systems, I emphasize the impact of 3N forces in reproducing the N=28 magic number in 48Ca and in predicting properties of 5056Ca, which indicate new N=32,34 magic numbers. Finally, I will highlight new efforts to quantify theoretical uncertainties in ab initio calculations of mediummass nuclei by exploring resolutionscale dependence of observables in sdshell isotopic/isotonic chains.  Adrian Ortega Eigenvalue and eigenvector statistics for bosonic embedded gaussian ensembles Within the framework in Random Matrix Theory (RMT), there exists the Bosonic Embedded Gaussian Ensembles. In the last few years, there has been a renewed interest in such ensembles. These ensembles display different eigenvalue and eigenvector correlations compared against the canonical ensembles of RMT. I shall describe briefly these bosonic ensembles when the singleparticle states are two. Novel results will be presented for three singleparticle states. In this framework, I shall describe also some numerical experiments on a variation of the BoseHubbard model, namely the Random BoseHubbard model. Another ongoing interesting project is the study of quantum dynamics in disordered networks, and the roles that play the particle correlations that benefits the transition probability between two ocupationnumber states.
Tuesday, October 7, 2014
9:30 AM
Morning Session: Introduction to Monte Carlo simulations of neutrontransport in nuclear reactors. Development of new Monte Carlo methods for reactorphysics applications

Jan Dufek
Morning Session: Introduction to Monte Carlo simulations of neutrontransport in nuclear reactors. Development of new Monte Carlo methods for reactorphysics applications
Jan Dufek
9:30 AM  11:30 AM
Room: 132:028
1)Introduction to Monte Carlo simulations of neutron transport in nuclear reactors  2) Development of new Monte Carlo methods for reactor physics applications
11:30 AM
Combined ab initiomean field approach to soluteatom diffusion in alloys.

Luca Messina
Combined ab initiomean field approach to soluteatom diffusion in alloys.
Luca Messina
11:30 AM  12:10 PM
Room: 132:028
Solute diffusion in alloys is mostly mediated by defectdriven mechanisms. In irradiated materials, the considerably large pointdefect population may enhance or even induce solute diffusion. In particular, in case of a binding solutedefect interaction, kinetic correlation effects may arise and lead to the formation of nanoscopic solutedefect complexes. The latter may be detrimental for the alloy structural integrity. In this talk we present a novel method for predicting the arising of solutedefect flux coupling in most types of alloys. The model combines firstprinciples calculations with an analytical mean field model and allows for the computation of solute transport and diffusion coefficients at low temperatures, which are usually inaccessible by means of experiments. The results for model dilute alloys will be presented, and implications on the structural integrity of nuclear reactor pressure vessel steels will be discussed.
2:30 PM
Afternoon Session: On the entropy for quantum unstable states

Osvaldo Civitarese
Afternoon Session: On the entropy for quantum unstable states
Osvaldo Civitarese
2:30 PM  3:10 PM
Room: 132:028
We discuss some of the prescriptions available in the literature about the definition of thermodynamical observables for quantum unstable states. The formalism is based on the use of resonances (states with complex energies) in the pathintegral formulation of path integrals and generating functions. The results are confronted mathematical oriented formulations of the problem.
3:40 PM
Neutrinonucleus scattering and supernova neutrinos

Emanuel A. Ydrefors
Neutrinonucleus scattering and supernova neutrinos
Emanuel A. Ydrefors
3:40 PM  4:20 PM
Room: 132:028
Neutrinos from corecollapse supernovae constitute valuable probes of both neutrino properties and of the currently unknown supernova mechanisms. Supernova neutrinos can be detected by using chargedcurrent and/or neutralcurrent neutrino scatterings off nuclei. Theoretical estimates of the nuclear responses for relevant nuclei are important for the interpretation of future experimental results. The calculation of neutrinonucleus cross sections constitute challenges both from the computational and theoretical points of view. In this talk the challenges related to computations of neutrino cross sections will be discussed. Recent results of calculated nuclear responses for nuclei which are relevant for future neutrino experiments will also be presented.
Wednesday, October 8, 2014
9:30 AM
Morning Session: Strongly correlated electron systems

Olivier Juillet
Alexandre Leprévost
Morning Session: Strongly correlated electron systems
Olivier Juillet
Alexandre Leprévost
9:30 AM  11:30 AM
Room: 132:028
Olivier Juillet Intertwined orders in strongly correlated electron systems. The quantum phase diagram of the twodimensional Hubbard model is investigated through the mixing of unrestricted HartreeFock and BCS wavefunctions with symmetry restoration before variation. The spin, charge, and superconducting orders entailed in such correlated states will be discussed as well as their evolution with hole doping and the onsite Coulomb repulsion. The relevance of the approach against exact results or numerical simulations when available will also be addressed.  Alexandre Leprévost Exact ground state of strongly correlated electron systems from symmetryrestored wavefunctions The four site Hubbard model is considered from the exact diagonalization and variational method points of view. We show that a symmetry projected meanfield theory recovers the exact ground state energy, irrespective of the interaction strength, in contrast to the conventional Gutzwiller wavefunction that will be also considered.
2:30 PM
Afternoon Session: Controlled healing of graphene nanopores

Kontantin Zakharchenko
Afternoon Session: Controlled healing of graphene nanopores
Kontantin Zakharchenko
2:30 PM  4:30 PM
Room: 132:028
Nanopores – nanometersize channels hold significant promise for numerous applications: DNA sequencing, sensing, biosensing and molecular detectors, and catalysis and water desalination. However, these applications require accurate control over the size of the nanopores. Our simulations clearly point to at least two distinct healing mechanisms for graphene sheets: edge attachment (where carbons are attached to the edges of the graphene sheet/pore) and direct insertion (where individual atoms insert directly into a sheet of graphene, even in the absence of the edges). The insertion mechanism is a surprising prediction that points to the growth process that would be operational in pristine graphene. We have uncovered an unusual dependence in the speed of nanopore regrowth and the structure of ‘‘healed’’ areas as a function of its size in a wide range of temperatures. Our findings point to significantly more complicated pathways for graphene annealing.
Thursday, October 9, 2014
9:30 AM
Morning Session: Quantum computing

Mohamed Bourennane
Hoshang HEYDARI
Morning Session: Quantum computing
Mohamed Bourennane
Hoshang HEYDARI
9:30 AM  11:30 AM
Room: 132:028
Hoshang Heydare Introduction  Mohamed Bourennane Quantum computing
2:30 PM
Afternoon Session: Hall viscosity of hierarchical quantum Hall states.

Mikael Fremling
Afternoon Session: Hall viscosity of hierarchical quantum Hall states.
Mikael Fremling
2:30 PM  4:30 PM
Room: 132:028
Using methods based on conformal field theory, we construct model wave functions on a torus with arbitrary flat metric for all chiral states in the abelian quantum Hall hierarchy. These functions have no variational parameters, and they transform under the modular group in the same way as the multicomponent generalizations of the Laughlin wave functions. Assuming the absence of Berry phases upon adiabatic variations of the modular parameter $\tau$, we calculate the quantum Hall viscosity and find it to be in agreement with the formula, given by Read, which relates the viscosity to the average orbital spin of the electrons. For the filling factor $\nu=2/5$ Jain state, which is at the second level in the hierarchy, we compare our model wave function with the numerically obtained ground state of the Coulomb interaction Hamiltonian in the lowest Landau level, and find very good agreement in a large region of the complex $\tau$ plane. For the same example, we also numerically compute the Hall viscosity and find good agreement with the analytical result for both the model wave function and the numerically obtained Coulomb wave function. We argue that this supports the notion of a generalized plasma analogy that would ensure that wave functions obtained using the conformal field theory methods do not acquire Berry phases upon adiabatic evolution.
Friday, October 10, 2014
9:30 AM
Morning Session: Quantum speed limits and optimal Hamiltonians for driven systems in mixed states

Hoshang Heydari
Morning Session: Quantum speed limits and optimal Hamiltonians for driven systems in mixed states
Hoshang Heydari
9:30 AM  11:30 AM
Room: 132:028
2:30 PM
Afternoon Session: The Manybody localization transition

Jonas Kjäll
Afternoon Session: The Manybody localization transition
Jonas Kjäll
2:30 PM  4:30 PM
Room: 132:028
Manybody localization is closely connected to some fundamental questions of quantum mechanics, like how and why quantum systems thermalize. It can protect quantum order at elevated temperatures and can potentially be important in the development of quantum memories. Manybody localization occurs in isolated quantum systems when Anderson localization persists in the presence of finite interactions. Despite strong evidence for the existence of a manybody localization transition a reliable extraction of the critical disorder strength has been difficult due to a large drift with system size in the studied quantities. In this talk I describe the challenges involved in this problem and explain our approaches, based on entanglement entropy, to understand it: (i) the variance of the halfchain entanglement entropy of exact eigenstates and (ii) the long time change in entanglement after a local quench from an exact eigenstate. With this we can estimate the critical disorder strength and its energy dependence. We investigate these quantities in a disordered quantum Ising chain that also has disorder protected quantum order at large disorder strength and provide evidence for it being a separate transition.