Black holes and their symmetries

Liste des Contributions

1. Third law of black hole mechanics for supersymmetric black holes

Harvey Reall

02/07/2025 10:15

5. Symmetries and peeling in the extremal Reissner-Nordström spacetime

Eric Gourgoulhon

02/07/2025 11:00

12. Semiclassical aspects of two-dimensional black holes: singularity resolution via a negative central charge

Jose Navarro Salas

02/07/2025 14:00

We analyze the semiclassical geometry of two-dimensional (CGHS) black holes in the Boulware vacuum. In this state, the expectation value of the stress-energy tensor is singular at the classical horizon. However, when backreaction effects are taken into account, the resulting geometry becomes horizonless and takes the form of a non-symmetric wormhole, featuring a curvature singularity beyond...

8. Deforming black holes and ultracompact objects from the inside and from the outside

Carlos Barcelo Seron

02/07/2025 14:45

11. Killing horizon data

Marc Mars

02/07/2025 16:00

16. Exotic properties of strongly interacting matter under acceleration and rotation

Maxim Chernodub

02/07/2025 16:45

Recent first-principles lattice simulations of SU(N) Yang-Mills theory in 3+1 dimensions have revealed that the gluon plasma—a precursor to the quark-gluon plasma believed to have existed in the early Universe—exhibits several unexpected equilibrium properties under extreme conditions: (i) a negative moment of inertia within a certain temperature range; (ii) the formation of a...

2. Gravitational wave generation beyond General Relativity

Barausse Enrico

03/07/2025 09:00

I will review how non-linearities can allow for screening solar-system
scales from non-tensorial gravitational polarizations, focusing on the
case of scalar-tensor theories with derivative self-interactions
(K-essence). I will then present fully relativistic simulations in
these theories in 1+1 dimensions (stellar oscillations and collapse)
and 3+1 dimensions (binary neutron stars),...

10. Gravitational wave tests of generic EFT-inspired theories of gravity

Laura Bernard

03/07/2025 10:15

19. Black hole binaries in an expanding Universe

Oscar Dias

03/07/2025 11:00

According to the Λ-Cold Dark Matter (ΛCDM) model, a positive cosmological constant explains
the accelerated expansion of the Universe. We start by constructing a static solution of general
relativity with a positive cosmological constant that consists of two (or more) static black holes
whose gravitational attraction is balanced by the cosmic expansion of the de Sitter background.
Then, we...

9. Hearts of Darkness: the inside-out probing of black holes

Stefano Liberati

03/07/2025 14:00

The standard paradigm of black holes, rooted in Einstein's General Relativity, predicts the existence of singularities. However, the emergence of quantum gravity candidates and new observational technologies have opened the door to exploring regular black holes and black hole mimickers as viable alternatives. These non-singular solutions, which replace the central singularity with a...

6. Simplicity and Universality in (Binary) Black Hole dynamics: an integrability f-Airy tale

Jose Luis Jaramillo

03/07/2025 14:45

17. Investigation of Non-Symmetric Black Hole Mimickers

Vagif Tagiev

03/07/2025 16:00

This presentation explores the classification of various configurations of
non-symmetric black hole mimickers, limited by the conditions
of spacetime regularity and geodesic completeness. For physically viable models, test metrics will be presented, and their parameters will
be analyzed in light of observational data from black hole shadow
experiments. Furthermore, scalar perturbations...

20. Black holes with electroweak hair I

Mikhael Volkov

03/07/2025 16:30

21. Black holes with electroweak hair II

Romain Gervalle

03/07/2025 17:00

14. Null infinity as a weakly isolated horizon

Simone Speziale

04/07/2025 09:00

I will present a common description of null infinity and physical
horizons, highlighting the geometric properties they share, and the
origin of the radically different physics they describe. The common
description offers new perspectives on the different symmetry groups
considered at finite distance. I will then show how ambiguities in the
construction of charges from Noether's theorem...

7. Equivalence Principle and generalised accelerating black holes from binary systems

Marco Astorino

04/07/2025 10:15

22. Gravitational S-matrix, infrared divergences and BMS representations

Yannick Herfray

04/07/2025 11:00

4. Dynamical formation of regular black holes

Pablo Bueno

04/07/2025 14:00

13. Some unconventional enhanced black hole symmetries with physical implications

Panagiotis Charalambous

04/07/2025 14:45

Exact continuous symmetries play a central role in constraining black hole dynamics. In this talk, I will discuss two examples of non-exact or non-continuous enhanced black hole symmetries that also have physical implications. One is the manifestation of SL(2,R) symmetries within the near-zone region, a region that extends beyond the near-horizon regime and has a non-empty overlap with the far...

15. The memory effect : from numerical to analytic study

Peter Horvathy

04/07/2025 16:00

The displacement of particles hit by a burst of gravitation waves called the Memory Effect, proposed by Braginski, Thorne, Zel'dovich, Polnarev, and others, is studied. The original proposal of Gibbons and Hawking admits only numerical solutions, however ingeneous approximations of the wave profile allow to find analytic solutions.

18. Breaking the SYMMETRIES in ANALOG GRAVITY or Why Experiments are DIFFICULT? The Point of View of Interfacial Hydrodynamics

Germain Rousseaux

3. Free-surface correlations on analogue black-hole water flows

Scott Robertson