Meeting PRIN "String Theory as a bridge between Gauge Theories and Quantum Gravity"
from
Thursday, June 22, 2023 (2:00 PM)
to
Friday, June 23, 2023 (1:00 PM)
Monday, June 19, 2023
Tuesday, June 20, 2023
Wednesday, June 21, 2023
Thursday, June 22, 2023
2:30 PM
Constructing solutions to crossing relations

Agnese Bissi
Constructing solutions to crossing relations
Agnese Bissi
2:30 PM  3:30 PM
Room: Room D
In this talk I will discuss how to write down generalized grouptheoretic crossing equations for a unitary Euclidean CFT and how to construct an exact solution to it. I will also present its connection to the cosmological bootstrap program.
3:30 PM
Coffee Break
Coffee Break
3:30 PM  4:00 PM
Room: Room D
4:00 PM
On the stability and deformability of topological stars

Giuseppe Sudano
On the stability and deformability of topological stars
Giuseppe Sudano
4:00 PM  4:45 PM
Room: Room D
Topological stars, or top star for brevity, are smooth horizonless static solutions of EinsteinMaxwell theory in 5d, that reduce to spherically symmetric solutions of EinsteinMaxwellDilaton theory in 4d. In the framework of the fuzzball program, they represent possible microstate geometries for nonsupersymmetric black holes. The study of linear scalar perturbations of top stars allows to argue for their stability and deformability. With different techniques, including WKB approximation, numerical analysis and quantum SeibergWitten curves, one can identify three classes of quasinormal modes: longlived metastable, prompt ringdown and 'blind' modes. The corresponding frequencies have negative imaginary part, thus suggesting linear stability for top stars. Moreover the tidal Love and dissipation numbers, encoding the response to tidal deformations, can be determined. Similarly to black holes, both of them vanish in the static limit; however, contrary to black holes, the dynamical Love number is nontrivial and there are no dissipative effects at linear order.
4:45 PM
A Rutherfordlike formula for scattering off KerrNewman BHs and subleading corrections

Claudio Gambino
(
Istituto Nazionale di Fisica Nucleare
)
A Rutherfordlike formula for scattering off KerrNewman BHs and subleading corrections
Claudio Gambino
(
Istituto Nazionale di Fisica Nucleare
)
4:45 PM  5:30 PM
Room: Room D
Analytic methods for studying gravitational processes have received review interest due to their application to gravitational wave phenomenology. In this direction, one of the challenges is to develop a systematic apparatus to obtain the dynamics of spinning objects from the classical limit of quantum scattering amplitudes. Exploring the KerrSchild gauge properties seems promising, and within this framework we study the scattering of a massive (charged) scalar off a KerrNewman black hole. In this gauge, the interactions between the probe and the target involve only trilinear vertices, and we manage to write down the treelevel scattering amplitudes in analytic form, from which we can construct an expression for the eikonal phase which is exact in the spin of the black hole at arbitrary order in the PostMinkowskian expansion. We compute the classical contribution to the crosssection and deflection angle at leading order for a Kerr black hole for arbitrary orientation of the spin. Finally, we test our method by reproducing the classical amplitude for a Schwarzschild black hole at second PostMinkowskian order and outline how to extend the analysis to the KerrNewman case.
5:30 PM
Discussion
Discussion
5:30 PM  5:45 PM
Room: Room D
5:45 PM
Meeting organizzativo PRIN

Massimo Bianchi
(
Università di Roma Tor Vergata
)
Meeting organizzativo PRIN
Massimo Bianchi
(
Università di Roma Tor Vergata
)
5:45 PM  6:15 PM
Room: Room D
Friday, June 23, 2023
9:30 AM
The case for dS_2

Dyonisos Anninos
The case for dS_2
Dyonisos Anninos
9:30 AM  10:30 AM
Room: Room D
We discuss the Euclidean picture of semi classical gravity with positive cosmological constant, and the GibbonsHawking relation for the cosmological horizon entropy. We argue that many features remain nontrivial in twodimensional toy models and discuss a variety of computational tools that can lead to exact expressions.
10:30 AM
Coffee Break
Coffee Break
10:30 AM  11:00 AM
Room: Room D
11:00 AM
Analytic bootstrap for magnetic impurities

Lorenzo Bianchi
(
Istituto Nazionale di Fisica Nucleare
)
Analytic bootstrap for magnetic impurities
Lorenzo Bianchi
(
Istituto Nazionale di Fisica Nucleare
)
11:00 AM  11:45 AM
Room: Room D
We will discuss two classes of line defects in the O(N) critical model at the WilsonFisher fixed point. These extended excitations are relevant for condensed matter systems, such as doped quantum antiferromagnets. After reviewing some stateoftheart analytic bootstrap techniques, we will apply them to compute the correlator of two bulk excitations at first order in the epsilon expansion. From this result we are able to extract an infinite set of defect CFT data.
11:45 AM
General Discussion
General Discussion
11:45 AM  12:30 PM
Room: Room D