Amplitudes 2016 International Conference

4 Jul 2016, 09:00 → 8 Jul 2016, 18:00 Europe/Stockholm

F2 (KTH Campus) (Nordita, Stockholm)

Henrik Johansson (Nordita and Uppsala University), Joseph Minahan (Uppsala University), Konstantin Zarembo (Nordita), Monica Guică (Nordita and Uppsala University), Paolo Di Vecchia (Nordita)

Scattering amplitudes have played a central role in quantum field theory since its inception. Recent years have seen a remarkable advance in our understanding and in our ability to compute scattering amplitudes, both for theoretical and phenomenological purposes. At the peak of the Nordic summer, Nordita and Stockholm will serve as hosts for the international conference Amplitudes 2016. The conference is devoted to exciting developments in the field of scattering amplitudes and related subjects. This includes, but is not limited to: amplitudes in gauge, gravity, and string theories, AdS/CFT and integrability, integrand structure of SYM and supergravity, IR and UV behavior, mathematics of polylogarithms and integrals, Grassmannians and twistor string approaches, symmetries and soft theorems, and connections to LHC phenomenology.

Schedule of talks.

Slides from the talks.

Videos from the talks (on Youtube).

Poster contributions (pdf files).

Invited speakers

Babis Anastasiou, ETH Zürich Benjamin Basso, ENS Paris Nathan Berkovits, São Paulo State Zvi Bern, UCLA Jacob Bourjaily, Niels Bohr Institute Simon Caron-Huot, Niels Bohr Institute Clifford Cheung, Caltech Marco Chiodaroli, AEI Potsdam

Lance Dixon, SLAC Claude Duhr, CERN David Dunbar, Swansea Einan Gardi, Edinburgh Yvonne Geyer, Oxford Michael Green, Cambridge Omer Gurdogan, ENS Paris Paul Heslop, Durham

Matin Mojaza, Nordita Ricardo Monteiro, Oxford Alexander Ochirov, Edinburgh Jan Plefka, Humboldt Robert Schabinger, Trinity College Dublin Amit Sever, Tel Aviv University Marcus Spradlin, Brown Stephan Stieberger, MPI Munich

Jaroslav Trnka, UC Davis Arkady Tseytlin, Imperial College Yifan Wang, MIT Congkao Wen, INFN Rome Christopher White, Glasgow Frank Wilczek, MIT Ellis Yuan, IAS Princeton Yang Zhang, ETH Zürich

Scientific Advisory Committee

• Nima Arkani-Hamed (IAS Princeton)
• Niklas Beisert (ETH Zürich)
• Zvi Bern (UCLA)
• Ruth Britto (Trinity College Dublin & IPhT/CEA Saclay)
• Henriette Elvang (University of Michigan)
• Gabriele Travaglini (Queen Mary U. of London)

Venue

The conference talks are located to the F2 lecture hall on the KTH campus, 15 min walk from Nordita, in the northern part of central Stockholm.

• Google map to lecture hall F2
• PDF map from subway station and from Nordita to lecture hall F2

Social Events

• Reception at Berns Salonger on Monday July 4, 7pm.
• Conference dinner at Fotografiska on Wednesday July 6, 7pm. [How to get to Fotografiska.]
• Suggestions for the free afternoon on Wednesday

Conference Poster

Design: Josh Nohle and Hans Mühlen

Financial Support

The conference is supported through funding from Nordita, Uppsala University, Knut and Alice Wallenberg Foundation and the Wenner-Gren Foundations.

Conference series

Amplitudes 2016 at Nordita is part of a conference series that begun in 2009. Previous and upcoming conferences are:

• 2009: IPPP Durham
• 2010: Queen Mary University of London
• 2011: University of Michigan, Ann Arbor
• 2012: DESY Hamburg
• 2013: Ringberg Castle
• 2014: IPhT Saclay
• 2015: ETH Zürich
• 2017: University of Edinburgh
• 2018: SLAC/Stanford

document

• Amplitudes2018.pdf
• Schedule_Amplitudes2.png
• Schedule_Amplitudes6.pdf

pictures banner_Amp2016.png

Slides Afternoon-handout.pdf Fotografiska.pptx.pdf

Monday 4 July

09:15 → 10:10 On the Regge Limit of Polygonal Wilson Loops

Speaker: Benjamin Basso (ENS)

Slides Basso.pdf

10:15 → 10:40 One-Loop Integrands from the Riemann Sphere

Speaker: Ricardo Monteiro (Oxford)

Slides Monteiro_nopause.pdf

11:15 → 11:40 Two-Loop Amplitudes from the Riemann Sphere

Speaker: Yvonne Geyer (Oxford)

Slides Geyer.pdf

11:45 → 12:25 Scattering Amplitudes and Cluster Algebras

Speaker: Marcus Spradlin (Brown)

Slides Spradlin.pdf

14:30 → 15:10 Multi-Regge Kinematics and Configurations of Points on the Riemann Sphere

Speaker: Claude Duhr (CERN & UCLouvain)

Slides Duhr.pdf

15:15 → 15:55 The 3-Loop Soft Anomalous Dimension in Multi-Leg Amplitudes

Speaker: Einan Gardi (Edinburgh)

Slides Gardi.pdf

16:30 → 17:10 Evaluating Four-Loop Three-Point Feynman Integrals by Differential Equations

Speaker: Vladimir Smirnov (SINP MSU)

Slides Smirnov.pdf

Tuesday 5 July

09:15 → 10:10 Untwisting the Pure Spinor Formalism

Speaker: Nathan Berkovits (ICTP-SAIFR/IFT-UNESP)

10:15 → 10:40 Simplifying Color and Kinematic Structures of QCD

Speaker: Alexander Ochirov (Edinburgh)

Slides Ochirov.pdf

11:15 → 11:40 N=2 Supergravities as Double Copies of Gauge Theories

Speaker: Marco Chiodaroli (AEI Potsdam)

Slides Chiodaroli.pdf

11:45 → 12:25 Some Modular Properties of String Scattering Amplitudes

Speaker: Michael Green (Cambridge)

Slides Green.pptx

12:30 → 14:30 Poster Session

14:30 → 15:10 Renormalization Group and the S-matrix

Speaker: Simon Caron-Huot (NBI)

Slides caron-huot.pdf

15:15 → 15:55 The Classical Double Copy

Speaker: Christopher White (Glasgow)

Slides White.pdf

16:30 → 17:10 Feynman Parametrization Revisited

Speaker: Ellis Yuan (IAS Princeton)

Slides YuanPDF.pdf

17:15 → 17:55 Singularity Structure of Gravity Amplitudes

Speaker: Jaroslav Trnka (UC Davis)

Slides Trnka.pdf

Wednesday 6 July

09:15 → 10:10 The Amplitude Bootstrap Reloaded

Speaker: Lance Dixon (SLAC)

Slides Lance.pdf

10:15 → 10:40 Integration-By-Parts Reduction from Unitarity, an Algebraic Geometry Story

Speaker: Yang Zhang (ETH)

Slides Zhang.pdf

11:15 → 11:40 Universality in the Soft Behavior of Dilatons in String and Field Theories

Speaker: Matin Mojaza (Nordita)

Slides [Handout]SoftDilatons.pdf

11:45 → 12:25 Four Point Amplitudes and Correlators in Planar N=4 SYM

Speaker: Paul Heslop (Durham)

Slides Heslop.pdf

Thursday 7 July

09:15 → 10:10 Higgs Hadroproduction: a Laboratory for Perturbation Theory

Speaker: Babis ANASTASIOU (ETH)

Slides Anastasiou.pdf

10:15 → 10:40 Superamplitudes and Non-renormalization Conditions in Supergravities

Speaker: Yifan Wang (MIT)

Slides Yifan.pdf

11:15 → 11:40 A Worst Case Survival Guide for the Four-Loop Form Factor

Speaker: Robert Schabinger (Trinity College Dublin)

Slides Schabinger.pdf

11:45 → 12:25 New Relations for Einstein-Yang-Mills Amplitudes

Speaker: Stephan Stieberger (MPI Munich)

Slides Stieberger.pdf

14:30 → 15:10 Constraining Effective Actions via Scattering Amplitudes

Speaker: Congkao Wen (INFN Rome)

Slides Wen.pdf

15:15 → 15:55 Holography, Soft Theorems, and Infinite-Dimensional Symmetries of Flat Space

Speaker: Clifford Cheung (Caltech)

Slides Cheung.pdf

16:30 → 17:10 Threshold Spectroscopy of Quantum Statistics

Speaker: Frank Wilczek (MIT)

Slides Wilczek.pdf

17:15 → 17:55 Asymptotic Uniqueness of The Veneziano Amplitude

We consider weakly coupled theories of massive higher spin particles. This class of models includes, for instance, tree-level String Theory and Large-N Yang-Mills theory. The S-matrix in such theories is a meromorphic function obeying unitarity and crossing symmetry. We discuss the (unphysical) regime s,t ≫ 1, in which we expect the amplitude to be universal and exponentially large. We develop methods to study this regime and show that the amplitude necessarily coincides with the Veneziano amplitude there. In particular, this implies that the leading Regge trajectory, j(t), is asymptotically linear in Yang-Mills theory. Further, our analysis shows that any such theory of higher spin particles has stringy excitations and infinitely many asymptotically parallel daughter trajectories. More generally, we argue that any weakly coupled theory with at least one higher spin particle must have strings.

Speaker: Amit Sever (Tel Aviv University)

Friday 8 July

09:15 → 09:55 On Scattering Amplitudes in Higher Spin Theories

Speaker: Arkady Tseytlin (Imperial College)

Slides tseytlin.pdf

10:00 → 10:40 Stratifying (Non-Planar) On-Shell Varieties

Speaker: Jacob Bourjaily (NBI)

11:15 → 11:40 Integrable Chiral Scalars and Feynman Integrals

Speaker: Omer Gurdogan (LPTENS)

Slides Gurdogan.pdf

11:45 → 12:25 CHY in the Collinear Limit

Speaker: Jan Plefka (Humboldt U.)

Slides Plefka.pdf

14:30 → 15:10 The Maximally Symmetric Two-Loop QCD Amplitudes

Speaker: David Dunbar (Swansea)

Slides Dunbar_Stockholm16.key

15:15 → 15:55 The Two-Loop Divergence of Gravity Reanalyzed

Speaker: Zvi Bern (UCLA)

Slides bern.pdf