Di Vecchia-80 Fest

15 May 2023, 10:00 → 16 May 2023, 18:00 Europe/Stockholm

FB53 (AlbaNova Main Building)

Henrik Johansson (Nordita/Uppsala U.), Konstantin Zarembo (Stockholm University), Niels Obers (Niels Bohr Institute), Oliver Schlotterer (Uppsala University)

Di Vecchia-80 Fest: May 15-16

 

During mid May 2023, Nordita will host a two-day workshop to celebrate the 80th anniversary of Paolo Di Vecchia. The topics covered will include both historic overviews and recent developments in string theory, gauge theory, gravitational physics, and related areas. 

The workshop will start at 10:00 on Monday May 15, and end 16:30 on Tuesday May 16. The talks are in FB53 (AlbaNova) on Monday, and Mega (6th floor Nordita) on Tuesday. The banquet will take place on Monday at 18:30. 

 

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Invited speakers

• Francesco Alessio
• Matteo Bertolini
• Marco Billò
• Lucile Cangemi
• Eric D'Hoker
• Marialuisa Frau
• Ferdinando Gliozzi
• Carlo Heissenberg
• Raffaele Marotta
• Alberto Lerda
• Rodolfo Russo
• Gabriele Veneziano

 

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Schedule

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Organizers

• Henrik Johansson
• Niels Obers
• Oliver Schlotterer
• Konstantin Zarembo

 

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Participation

In order to participate in the two-day workshop, and banquet, please contact one of the above listed organizers and state your interest to attend the event.  

 

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Participants  

Vladimir Bashmakov Iouri Belokopytov Ingemar Bengtsson Maor Ben-Shahar Marcus Berg Matteo Bertolini Marco Billò Lara Bohnenblust Axel Brandenburg Lucile Cangemi Marco Chiodaroli Eric D'Hoker

Paolo Di Vecchia Giulia Fardelli Gabriele Ferretti Marialuisa Frau Lucia Garozzo Alessandro Georgoudis Suvendu Giri Ferdinando Gliozzi Kevin Grosvenor Max Guillen Sabine Harribey Carlo Heissenberg

Martijn Hidding Henrik Johansson Johannes Lahnsteiner Edwin Langmann Alberto Lerda Raffaele Marotta Dhrubaditya Mitra Hans Mühlen Niels Obers Gerben Oling Paolo Pichini Carlos Rodriguez

Rodolfo Russo Oliver Schlotterer Yoann Sohnle Bo Sundborg Larus Thorlacius Gabriele Veneziano Ziqi Yan Zhewei Yin Maxim Zabzine Konstantin Zarembo

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Venue

Nordita, Stockholm, Sweden

Sponsored by:

Monday 15 May

10:00 Welcome/Coffee

1 The DRM-String transition and the Supergroup story

Speaker: Prof. Ferdinando Gliozzi (INFN, Turin)

paolofest.pdf

2 QCDing with Paolo: a break from the string

Speaker: Prof. Gabriele Veneziano (College de France & CERN)

PaoloFest.key.pdf

12:00 Lunch

3 Loop Amplitudes in String Theory

Speaker: Prof. Alberto Lerda (INFN, Turin)

paolo_fest.pdf

4 D-branes and gauge/gravity correspondence

Speaker: Prof. Marialuisa Frau (INFN, Turin)

Paolofest_Frau.pdf

15:15 Coffee & Cake

5 Superstring Amplitudes: From Threshold Effects to Soft Theorems and Back?

Speaker: Prof. Raffaele Marotta (INFN, Naples)

Di Vecchia_Nordita.pdf

Di Vecchia_Nordita.pptx

6 Gravitational scattering at high energies

Speaker: Prof. Rodolfo Russo (QMUL)

150523.pdf

7 Filling the gaps

Speaker: Prof. Paolo Di Vecchia (Nordita)

Paolo80.pdf

18:30 Banquet

Tuesday 16 May

10:00 Coffee

8 The Rise of the Octagon - Towards the gravity dual of dynamical supersymmetry breaking

In the context of the gauge/gravity correspondence I will present a model where supersymmetry is broken dynamically into stable vacua. This is based on a system of D-branes placed at the tip of the so-called Octagon singularity and represents the first such instance within the correspondence. The model fills a gap in top-down stringy descriptions of the diverse phases and IR dynamics that supersymmetric gauge theories can enjoy, and paves the way for a gravity/geometric dual of dynamical supersymmetry breaking. The relevance of this result in the wider context of the string landscape and the swampland program will also be discussed.

Speaker: Prof. Matteo Bertolini (SISSA, Trieste)

Bertolini_PDV_Nordita.pdf

9 Towards higher multiplicity 2-loop string amplitudes

Progress is made towards the evaluation of superstring amplitudes of higher multiplicity at two loops and beyond by reducing the spin structure dependence of worldsheet correlators to that of certain modular tensors. For two loops, a system of trilinear relations obeyed by these modular tensors allows the evaluation of the spin structure sums for arbitrary multiplicity.

Speaker: Prof. Eric D'Hoker (UCLA)

D'Hoker-Paolo Fest.pdf

12:00 Lunch

10 Stringy effects in the holographic description of the N=2 SCFT quiver theory

We consider a $\mathcal{N}=2$ SCFT in $d=4$ described by a circular quiver with $M$ nodes. The protected chiral single traces can be organized in unwtisted and twisted operators. The structure constants of such operators can be computed at large $N$ using localization and the result can be continued towards strong 't Hooft coupling. In this regime we can check it against the holographic description of the theory on $AdS_5 \times S_5/Z_M$. The untwisted and twisted/untwisted structure constants are precisely accounted for by the Witten diagrams derived from the supergravity lagrangian. In the case of the structure constants involving only twisted operators - which in the gauge theory side is on par with the other cases - the needed cubic vertices should come instead from higher derivative corrections due to the interaction of three twisted closed strings. Preliminary results indicate that this is indeed the case.

Speaker: Prof. Marco Billo (INFN, Turin)

marco-billo-divecchia80.pdf

11 Classical Higher-Spin Amplitudes and Kerr Black Holes

I will discuss the role of gauge symmetry for constraining Kerr dynamics. EFTs for both Kerr black holes and the closely related electromagnetic root-Kerr solution are considered using Stückelberg fields. This uniquely predicts the known Kerr three-point amplitudes to all spin using Ward identities that follow from massive gauge symmetry. I will also discuss aspects relevant to the analysis of the spin-s Compton amplitude and provide some explicit all-spin results for the non-Abelian root-Kerr Compton amplitude.

Speaker: Lucile Cangemi (Uppsala University)

PaoloFest_Cangemi.pdf

15:00 Coffee

12 Binary dynamics of spinning black holes in the Post-Minkowskian regime

I will discuss different aspects and approaches to the Kerr binary problem using scattering amplitudes techniques. In particular, I will start by showing the construction of a Lagrangian relevant to describe Kerr binaries, deriving expressions for the classical amplitude for the elastic 2—>2 process at 1PM and 2PM. I will then consider radiation reaction effects and their connection to the imaginary part of the 3PM spinning eikonal phase. Eventually, I will mention partial new results for the Compton amplitude involving spinning objects coming from string theory.

Speaker: Francesco Alessio (Nordita)

Paolo’s conference.pdf

13 Inelastic exponentiation and gravitational waveforms

The classical limit of scattering amplitudes provides a convenient strategy to calculate gravitational observables associated to black-hole encounters. Taking this limit requires a resummation in the effective coupling, known as the eikonal exponentiation. In this talk, I will present recent progress on the operator version of this exponentiation, which combines elastic (two-to-two) with inelastic (two-to-three) channels to produce a unitary description of the scattering process. I will illustrate how including tree-level and one-loop contributions to the eikonal operator allows us to access the leading and subleading waveforms describing the gravitational waves produced during a black-hole scattering process. The latter involve the so-called tail effects, whereby the emitted gravitational radiation can re-scatter against the curvature induced by each black hole.

Speaker: Carlo Heissenberg (Uppsala University)

Slides_Heissenberg169.pdf