Exploring non-linear gravitational waves in Horndeski gravity

• Jibril Ben Achour (LPENSL)

Room: Grand Amphithéâtre

Singularity-Free Spherical Black Holes with LQG corrections

• Asier Alonso (CPT)

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.

Typical multipartite entanglement in large quantum systems - blackboard talk

• Sylvain Carrozza (IMB Dijon)

Room: Grand Amphithéâtre

Quantum Gravity Projects: Symmetries, Spinfoams and Spin network Dynamics - blackboard talk

• Etera Livine (LPENSL)

Room: Grand Amphithéâtre Blackboard talk

Quasi-normal modes of LQG black holes

• Clara Montagnon (LPENSL)

Room: Grand Amphithéâtre

Three puzzles in LQG (technical) - blackboard talk

• Simone Speziale (CPT)

Room: Grand Amphithéâtre

New Wald-Zoupas charges for BMS

• Antoine Rignon-Bret (CPT)

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.

News from Grenoble

• Aurélien Barrau (LPSC)

Room: Grand Amphithéâtre

Generalized holonomy corrections in effective LQC : Consistency and phenomenological consequences

• Maxime De-Sousa (LPSC)

Room: Grand Amphithéâtre

Fluid systems as gauge theories - blackboard talk

• Marc Geiller (LPENSL)

Room: Grand Amphithéâtre

Light-cone thermodynamics

• Salvatore Ribisi (CPT)

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).

Graviton corrections to Newton's potential as a test for non perturbative black hole models

• Sami Viollet (CPT)

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.

Noncommutative geometry and Quantum Gravity

• Valentine Maris (LPENSL)

Room: Grande salle du conseil

New elements on high frequency gravitational waves

• Killian Martineau (LPSC - Grenoble)

Room: Grand Amphithéâtre