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Black Holes Inside and Out 2024: visions for the future of black hole physics
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The gravitational physics landscape is evolving rapidly, driven by our ability to study strong-field regions, in particular black holes. Black Holes Inside and Out gathered world experts to discuss the status of the field and prospects ahead. We hope that the ideas and perspectives are a source of inspiration. Structure: Black Hole Evaporation - 50 Years by William Unruh The Stability Problem for Extremal Black Holes by Mihalis Dafermos The Entropy of Black Holes by Robert M. Wald The Non-linear Regime of Gravity by Luis Lehner Black Holes Galore in D > 4 by Roberto Emparan Same as Ever: Looking for (In)variants in the Black Holes Landscape by Carlos A. R. Herdeiro Black Holes, Cauchy Horizons, and Mass Inflation by Matt Visser The Backreaction Problem for Black Holes in Semiclassical Gravity by Adrian del Rio Black Holes Beyond General Relativity by Enrico Barausse and Jutta Kunz Black Holes as Laboratories: Searching for Ultralight Fields by Richard Brito Primordial Black Holes from Inflation by Misao Sasaki Tests of General Relativity with Future Detectors by Emanuele Berti Black Holes as Laboratories: Tests of General Relativity by Ruth Gregory and Samaya Nissanke Simulating Black Hole Imposters by Frans Pretorius Black Hole Spectroscopy: Status Report by Gregorio Carullo VLBI as a Precision Strong Gravity Instrument by Paul Tiede Testing the nature of compact objects and the black hole paradigm by Mariafelicia De Laurentis and Paolo Pani Some Thoughts about Black Holes in Asymptotic Safety by Alessia Platania Black Hole Evaporation in Loop Quantum Gravity by Abhay Ashtekar How the Black Hole Puzzles are Resolved in String Theory by Samir D. Mathur Quantum Black Holes: From Regularization to Information Paradoxes by Niayesh Afshordi and Stefano Liberati
Forward citations
Cited by 18 Pith papers
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All $2D$ generalised dilaton theories from $d\geq 4$ gravities
Generic 2D Horndeski theories arise from dimensional reduction of d≥4 gravities, yielding a Birkhoff theorem for quasi-topological gravities where static spherically symmetric solutions satisfy g_tt g_rr = -1 and are ...
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Regular black holes from pure gravity in four dimensions
A construction of four-dimensional pure-gravity actions whose vacuum solutions include the Hayward and Dymnikova regular black holes, via a lift from two-dimensional Horndeski theory.
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Spherically symmetric solutions in quasi-local Einstein-Weyl gravity
In quasi-local Einstein-Weyl gravity, static spherically symmetric Frobenius solutions are classified: regular cores only, Schwarzschild-like horizons and wormhole throats, plus asymptotic 1/r^6 corrections to Schwarzschild.
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Superradiant amplification by rotating viscous compact objects
Using causal BDNK hydrodynamics, the authors derive coupled gravitational-wave and viscous-mode equations for slowly rotating stars and find superradiant amplification at low frequencies.
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Thermodynamics of Black Holes, far from Equilibrium
The paper derives finite, physical-process versions of the first and second laws of black hole thermodynamics for dynamical horizon segments, extending the first law to black holes arbitrarily far from equilibrium.
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Timelike convergence condition in regular black-hole spacetimes with (anti-)de Sitter core
In spherical symmetry the timelike convergence condition reduces to three mass-function inequalities, and the new one forces every smooth de Sitter core regular black hole to violate the TCC near the core.
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Cauchy Horizon (In)Stability of Regular Black Holes
For regular black holes, the Cauchy horizon mass typically grows exponentially or as a power law; for the asymptotically safe collapse model it grows logarithmically, reaching the horizon without a transient mass-infl...
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Thermodynamics of black and white holes in ensemble of Planckons
A toy model counting pairs of Planckons gives integer black hole entropy, negative white hole entropy, charge-independent Reissner-Nordstrom entropy, and a quantized cosmological constant.
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Null orbits and shadows in the Ernst-Wild geometry: insights for black holes immersed in a magnetic field
For a magnetized Kerr-Newman (Ernst-Wild) black hole, this paper derives perturbative formulas for light ring radii, orbital frequencies, and Lyapunov exponents as functions of magnetic field and spin, and checks the ...
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Extreme mass ratio inspirals around topological stars
A scalar charge orbiting a topological star produces fluxes that deviate from the black hole case and can dephase by up to 10^4 radians over a year, while QNM resonances are too narrow to be observable.
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Page Time of Primordial Black Holes in the Standard Model and Beyond
For Standard Model emission, a Schwarzschild primordial black hole of about 6.23 x 10^14 grams would reach its Page time at the current age of the Universe.
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Charting GLOBs in Asymptotically Safe Gravity
Within the Einstein-Weyl truncation, asymptotically safe gravity predicts a Weyl coefficient m_2 = 1.4 m_Pl, which constrains the phase diagram of compact objects: attractive naked singularities are disfavored while w...
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Black hole thermodynamics and topology
The author derives S_RN = 4πM^2 for Reissner-Nordström black holes by adding the inverse temperatures of both horizons, contradicting the standard area law.
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Extended Tsallis-Cirto entropy for black and white holes
White hole entropy is proposed to be minus the black hole entropy of the same mass, and a modified composition rule makes charged black hole entropy depend only on mass.
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Massive particles tunneling from quantum Oppenheimer-Snyder black holes and black hole entropy
Massive scalar particle tunneling from the quantum Oppenheimer-Snyder black hole yields an emission rate and entropy formula with a logarithmic correction from loop quantum gravity, extending prior massless results.
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Black hole tunneling in loop quantum gravity
Using the Parikh-Wilczek tunneling method on a loop-quantum-gravity-corrected Schwarzschild metric, the paper derives a logarithmic correction to black hole entropy, but the correction coefficient conflicts with the m...
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Can We Detect Deviations from Einstein's Gravity in Black Hole Ringdowns?
Higher-derivative corrections to black hole ringdown spectra and quadratic modes are either absent or suppressed below detectability once causality is enforced, leaving Einstein's gravity as the sole observable description.
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Towards a Non-singular Paradigm of Black Hole Physics
This is a review built around a week-long workshop, synthesizing the state and open problems of regular black holes and black hole mimickers as alternatives to singular black holes.
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