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Black holes and their symmetries

2–4 juil. 2025
Tours
Fuseau horaire Europe/Paris

Liste des Contributions

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  1. 1. Third law of black hole mechanics for supersymmetric black holes
    Harvey Reall
    02/07/2025 10:15
  2. 5. Symmetries and peeling in the extremal Reissner-Nordström spacetime
    Eric Gourgoulhon
    02/07/2025 11:00
  3. 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...

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  4. 8. Deforming black holes and ultracompact objects from the inside and from the outside
    Carlos Barcelo Seron
    02/07/2025 14:45
  5. 11. Killing horizon data
    Marc Mars
    02/07/2025 16:00
  6. 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...

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  7. 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),...

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  8. 10. Gravitational wave tests of generic EFT-inspired theories of gravity
    Laura Bernard
    03/07/2025 10:15
  9. 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...

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  10. 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...

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  11. 6. Simplicity and Universality in (Binary) Black Hole dynamics: an integrability f-Airy tale
    Jose Luis Jaramillo
    03/07/2025 14:45
  12. 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...

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  13. 20. Black holes with electroweak hair I
    Mikhael Volkov
    03/07/2025 16:30
  14. 21. Black holes with electroweak hair II
    Romain Gervalle
    03/07/2025 17:00
  15. 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...

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  16. 7. Equivalence Principle and generalised accelerating black holes from binary systems
    Marco Astorino
    04/07/2025 10:15
  17. 22. Gravitational S-matrix, infrared divergences and BMS representations
    Yannick Herfray
    04/07/2025 11:00
  18. 4. Dynamical formation of regular black holes
    Pablo Bueno
    04/07/2025 14:00
  19. 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...

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  20. 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.

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  21. 18. Breaking the SYMMETRIES in ANALOG GRAVITY or Why Experiments are DIFFICULT? The Point of View of Interfacial Hydrodynamics
    Germain Rousseaux
  22. 3. Free-surface correlations on analogue black-hole water flows
    Scott Robertson