Name: Workshop: New directions on classical and quantum gravity
Start: 2023-12-12T09:00:00+01:00
End: 2023-12-13T18:00:00+01:00
Location: LPSC

Workshop: New directions on classical and quantum gravity

de mardi 12 décembre 2023 (09:00) à mercredi 13 décembre 2023 (18:00)

lundi 11 décembre 2023
mardi 12 décembre 2023

09:30 Welcome coffee
Welcome coffee
09:30 - 11:00
Room: Grand Amphithéâtre
11:00 Exploring non-linear gravitational waves in Horndeski gravity - Jibril Ben Achour (LPENSL)
Exploring non-linear gravitational waves in Horndeski gravity
- Jibril Ben Achour (LPENSL)
11:00 - 11:30
Room: Grand Amphithéâtre
11:30 Singularity-Free Spherical Black Holes with LQG corrections - Asier Alonso (CPT)
Singularity-Free Spherical Black Holes with LQG corrections
- Asier Alonso (CPT)
11:30 - 12:00
Room: Grand Amphithéâtre I will present a family of spherical charged black holes in cosmological backgrounds which are solutions to an effective Hamiltonian with holonomy corrections motivated by loop quantum gravity.
12:00 Lunch Break
Lunch Break
12:00 - 14:00
14:00 Typical multipartite entanglement in large quantum systems - blackboard talk - Sylvain Carrozza (IMB Dijon)
Typical multipartite entanglement in large quantum systems - blackboard talk
- Sylvain Carrozza (IMB Dijon)
14:00 - 14:30
Room: Grand Amphithéâtre
14:30 Quantum Gravity Projects: Symmetries, Spinfoams and Spin network Dynamics - blackboard talk - Etera Livine (LPENSL)
Quantum Gravity Projects: Symmetries, Spinfoams and Spin network Dynamics - blackboard talk
- Etera Livine (LPENSL)
14:30 - 15:00
Room: Grand Amphithéâtre Blackboard talk
15:00 Quasi-normal modes of LQG black holes - Clara Montagnon (LPENSL)
Quasi-normal modes of LQG black holes
- Clara Montagnon (LPENSL)
15:00 - 15:30
Room: Grand Amphithéâtre
15:30 Coffee break
Coffee break
15:30 - 16:00
Room: Grand Amphithéâtre
16:00 Three puzzles in LQG (technical) - blackboard talk - Simone Speziale (CPT)
Three puzzles in LQG (technical) - blackboard talk
- Simone Speziale (CPT)
16:00 - 16:30
Room: Grand Amphithéâtre
16:30 New Wald-Zoupas charges for BMS - Antoine Rignon-Bret (CPT)
New Wald-Zoupas charges for BMS
- Antoine Rignon-Bret (CPT)
16:30 - 17:00
Room: Grand Amphithéâtre In this talk, I will construct new BMS charges which are able to measure some local energy flux on the celestial sphere. For this, I will introduce an edge mode, the supertranslation field, that has already been encountered in the literature. I will show that the new charges represent the BMS group, are covariant and independent on any choice of background structure, i.e choice of foliation or conformal factor. Furthermore, there is no cocycle or central extension in the representation of the algebra. I will check that these charges have all the properties required for an asymptotic notion of (local) energy on the celestial sphere.
mercredi 13 décembre 2023
09:30 News from Grenoble - Aurélien Barrau (LPSC)
News from Grenoble
- Aurélien Barrau (LPSC)
09:30 - 10:00
Room: Grand Amphithéâtre
10:00 Generalized holonomy corrections in effective LQC : Consistency and phenomenological consequences - Maxime De-Sousa (LPSC)
Generalized holonomy corrections in effective LQC : Consistency and phenomenological consequences
- Maxime De-Sousa (LPSC)
10:00 - 10:30
Room: Grand Amphithéâtre
10:30 Coffee break
Coffee break
10:30 - 11:00
Room: Grand Amphithéâtre
11:00 Fluid systems as gauge theories - blackboard talk - Marc Geiller (LPENSL)
Fluid systems as gauge theories - blackboard talk
- Marc Geiller (LPENSL)
11:00 - 11:30
Room: Grand Amphithéâtre
11:30 Light-cone thermodynamics - Salvatore Ribisi (CPT)
Light-cone thermodynamics
- Salvatore Ribisi (CPT)
11:30 - 12:00
Room: Grand Amphithéâtre After introducing the main ideas behind light-cone thermodynamics, I will explicitly express the Minkowski vacuum of a massless scalar field in terms of the particle notion associated with suitable spherical conformal killing fields. These fields are orthogonal to the light wavefronts originating from a sphere with a radius of rH in flat spacetime: a bifurcate conformal killing horizon that exhibits semiclassical features similar to those of black hole horizons and Cauchy horizons of non-extremal spherically symmetric black holes. Our result highlights the quantum aspects of this analogy and extends the well-known decomposition of the Minkowski vacuum in terms of Rindler modes, which are associated with the boost Killing field normal to a pair of null planes in Minkowski spacetime (the basis of the Unruh effect).
12:00 Lunch Break
Lunch Break
12:00 - 13:30
Room: Grand Amphithéâtre
13:30 Graviton corrections to Newton's potential as a test for non perturbative black hole models - Sami Viollet (CPT)
Graviton corrections to Newton's potential as a test for non perturbative black hole models
- Sami Viollet (CPT)
13:30 - 14:00
Room: Grande salle du conseil On the one hand it is possible to determine graviton corrections to Newton's potential by treating GR as an effective field theory. On the other hand there are a multitude of quantum black hole models written as modifications of the Schwarzschild metric. I will show how it is possible to use these metrics to determine corrections to Newton's potential. I will show that in the case of the Hayward metric the corrections do not correspond to the graviton ones. Finally, I will present a generic method for testing whether a modified metric reproduces the graviton corrections to Newton's potential.
14:00 Noncommutative geometry and Quantum Gravity - Valentine Maris (LPENSL)
Noncommutative geometry and Quantum Gravity
- Valentine Maris (LPENSL)
14:00 - 14:30
Room: Grande salle du conseil
14:30 New elements on high frequency gravitational waves - Killian Martineau (LPSC - Grenoble)
New elements on high frequency gravitational waves
- Killian Martineau (LPSC - Grenoble)
14:30 - 15:00
Room: Grand Amphithéâtre
15:00 Goodbye coffee
Goodbye coffee
15:00 - 16:00
Room: Grande salle du conseil