ATTENZIONE: Lunedì 15 Luglio, dalle 13:00 alle 15:00 sarà effettuato un intervento di manutenzione su agenda.infn.it. Durante tale fascia oraria il servizio potrà risultare non raggiungibile.


ATTENTION: On Monday 15 July, from 1:00 pm to 3:00 pm, maintenance will be carried out on agenda.infn.it. During this time slot, the service may be unreachable.

Meeting PRIN "String Theory as a bridge between Gauge Theories and Quantum Gravity"

Europe/Rome
Aula C (University of Turin - Department of Physics)

Aula C

University of Turin - Department of Physics

Via Pietro Giuria 1, Torino
Lorenzo Bianchi (UniTO e INFN Torino), Marialuisa Frau (UniTO e INFN Torino), Alberto Lerda (U.P.O. e INFN Torino)
Description

Participants
  • Alberto Lerda
  • Alberto Ruffino
  • Alejandro Ruiperez
  • Alessandro Pini
  • Andrea Arduino
  • Anna Teresa Ceresole
  • Bianca Letizia Cerchiai
  • Carlo Maccaferri
  • Cristoforo Iossa
  • Dripto Biswas
  • Ekaterina Sysoeva
  • Elia de Sabbata
  • Fabrizio Corelli
  • Francesco Galvagno
  • Gianfausto Dell'Antonio
  • Giulio Bonelli
  • Gregory Korchemsky
  • Igor Pesando
  • Jose Francisco Morales
  • Laura Maria Andrianopoli
  • Lorenzo Bianchi
  • Marco Billo'
  • Marialuisa Frau
  • Massimo Bianchi
  • Matteo Bertolini
  • Nicolò Brizio
  • Paolo Pani
  • Paolo Vallarino
  • Rodolfo Russo
  • Stefano Giusto
  • Thursday, February 23
    • 1
      Tracy-Widom distribution in supersymmetric gauge theories Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino

      It was recently recognized that various observables in four-dimensional supersymmetric gauge theories can be computed for an arbitrary 't Hooft coupling as determinants of certain semi-infinite matrices. I will show that these quantities can be expressed as Fredholm determinants of the so-called Bessel kernel and they are closely related to celebrated Tracy-Widom distribution (more precisely, its finite temperature generalization) describing level-spacing distributions in matrix model.

      Speaker: Gregory P. Korchemsky (Saclay, IPhT)
    • 3:30 PM
      Coffee break Sala Wataghin

      Sala Wataghin

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino
    • 2
      Corrections to the thermodynamics of AdS$_5$ black holes and the superconformal index Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino

      We consider a four-derivative extension of minimal gauged supergravity in five dimensions and use it to evaluate the on-shell action of AdS$_5$ black holes, showing that it fully matches the result from the superconformal index ``on the second sheet” after imposing supersymmetry. We then compute the corrected black hole thermodynamics and we find a formula of the BPS entropy as a function of the charges. The latter is shown to match both the Legendre transform of the superconformal index and the Wald entropy. Based on 2208.01007 [hep-th] and on work in progress.

      Speaker: Alejandro Ruiperez (Roma Tor Vergata)
    • 3
      Higher rank equivariant Donaldson-Witten theory Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino

      Partition function and correlation functions of the topologically twisted $\mathcal{N} = 2$ super Yang-Mills theory on a smooth four-manifold with gauge group $SU(2)$, also known as Donaldson-Witten theory, provide us a way to compute topological invariants of many manifolds classifying their smooth structure (Donaldson invariants). Equivariantisation of this theory, on the one hand, can be considered as a tool to find the original invariants by means of the equivariant localisation, and on the other hand, is interesting by itself, since it also has a topological counterpart (equivariant Donaldson invariants). While for the equivariant Donaldson-Witten theory with $SU(2)$, gauge group quite a lot of results were found, there is still not much known in the case of the higher rank gauge symmetry.
      After giving an introduction on the subject I will present our recent results for the higher rank theory, which include generalisation of the recurrence relation for the partition function on $\mathbb{C}^2$ (Zamolodchikov relation) and a proposal for the equivariant Donaldson invariants of the compact toric manifolds.

      Speaker: Ekaterina Sysoeva (SISSA)
    • 5:30 PM
      Discussion Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino
    • 4
      Meeting organizzativo PRIN Sala Wataghin

      Sala Wataghin

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino
      Speaker: Massimo Bianchi (Università di Roma Tor Vergata)
  • Friday, February 24
    • 5
      Holography with heavy states as a tool to study black holes Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino

      In holographic CFTs it is interesting to study operators whose dimension scales as the central charge when the latter is taken to be large. As an example of such operators, I consider multi-particle states formed by a large number of BPS single-particle constituents. Focusing on the example of the (AdS_3 x S^3)/CFT_2 duality, I discuss how the gravitational backreaction of these heavy states is described by regular geometries that encode interesting CFT data. The quadratic fluctuations around these geometries capture the heavy-light four point correlators. Finally I comment on similarities and differences between these correlators and similar quantities calculated in the background of asymptotically AdS black holes.

      Speaker: Rodolfo Russo (Queen Mary University of London)
    • 10:30 AM
      Coffee break Sala Wataghin

      Sala Wataghin

      University of Turin - Department of Physics

    • 6
      Fate of Radiating Black Holes With Minimum Mass in Einstein-dilaton-Gauss-Bonnet Theory of Gravity Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino

      Einstein-dilaton-Gauss-Bonnet (EdGB) is a theory of modified gravity in which a dilaton-type scalar field is nonminimally coupled to quadratic curvature terms via an exponential function. Black holes (BHs) in this theory are particularly interesting since they possess a critical configuration with minimum mass and finite Hawking temperature. This means that a critical BH loses mass due to Hawking's radiation, but it is not clear what is its fate after this process, since it cannot reach a final configuration with lower mass.
      In a recent work we studied this problem by means of fully nonlinear numerical evolutions of spherically symmetric BH spacetimes. Specifically, by simulating the collapse of wave packets of a phantom scalar field we have been able to dynamically reduce the BH mass, reproducing the effect of Hawking's evaporation.
      In this talk I will present our results with a particular focus on the case in which the BH mass falls below the critical value. In particular, I will show that a high-curvature elliptic region emerges from the apparent horizon, and I will discuss how this could hint to an incompatibility between EdGB gravity and Hawking evaporation. I will also mention some alternative scenarios for a stable evolution, and future possible research directions.

      Speaker: Fabrizio Corelli (Sapienza Università di Roma)
    • 11:45 AM
      General discussion Aula C

      Aula C

      University of Turin - Department of Physics

      Via Pietro Giuria 1, Torino