Causal sets can approximate black hole horizons via discrete timelike curves and ladders tracing null geodesics, with a discrete expansion changing sign across the horizon in a 1+1D toy model.
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Rotating black holes with primary scalar hair in beyond Horndeski gravity produce shadows whose diameter increases for negative Q and whose distortion increases for positive Q, with EHT bounds on M87* restricting but not ruling out the (a, Q) parameter space.
Constrained polarization model for Kerr ringdown modes enables inclination inference from two-detector data for non-precessing mergers but introduces biases when applied to precessing systems.
Magnetic reconnection enables higher energy extraction efficiency from singly-rotating five-dimensional Kerr black holes than from doubly-rotating ones and can exceed the Blandford-Znajek process in the single-rotation case.
Two families of regular hairy black holes are generated from Bardeen and Minkowski-core seeds using gravitational decoupling with an exponential profile, yielding de Sitter or flat cores, critical horizon parameters, and rotating extensions that satisfy the weak energy condition outside.
An RG-improved Schwarzschild-like black hole yields a multipole-independent SCC ratio at the 6% level, a bell-shaped Hawking temperature, and remains the most Schwarzschild-like among regular black hole models while shadow-degenerate with Hayward and Bonanno-Reuter at the 1% level.
Bound states of a massive scalar field around topological stars form strictly normal modes, producing a hydrogen-like spectrum when the Compton wavelength exceeds the star size and localized states otherwise.
No evidence for deviations from general relativity is found in LIGO-Virgo binary black hole events, with improved constraints on waveform parameters, graviton mass, and ringdown properties.
Dynamical evolution of Schwarzschild black holes produces new interior singularities absent in the static case, with resolution imposing highly restrictive conditions on gravitational collapse.
citing papers explorer
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Towards black-hole horizons and geodesic focusing in causal sets
Causal sets can approximate black hole horizons via discrete timelike curves and ladders tracing null geodesics, with a discrete expansion changing sign across the horizon in a 1+1D toy model.
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Rotating Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity
Rotating black holes with primary scalar hair in beyond Horndeski gravity produce shadows whose diameter increases for negative Q and whose distortion increases for positive Q, with EHT bounds on M87* restricting but not ruling out the (a, Q) parameter space.
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Polarization Analysis of Ringdown Signals
Constrained polarization model for Kerr ringdown modes enables inclination inference from two-detector data for non-precessing mergers but introduces biases when applied to precessing systems.
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Magnetic reconnection in five-dimensional Kerr black hole
Magnetic reconnection enables higher energy extraction efficiency from singly-rotating five-dimensional Kerr black holes than from doubly-rotating ones and can exceed the Blandford-Znajek process in the single-rotation case.
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Regular hairy black holes by gravitational decoupling: Bardeen and Minkowski-core seeds
Two families of regular hairy black holes are generated from Bardeen and Minkowski-core seeds using gravitational decoupling with an exponential profile, yielding de Sitter or flat cores, critical horizon parameters, and rotating extensions that satisfy the weak energy condition outside.
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Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
An RG-improved Schwarzschild-like black hole yields a multipole-independent SCC ratio at the 6% level, a bell-shaped Hawking temperature, and remains the most Schwarzschild-like among regular black hole models while shadow-degenerate with Hayward and Bonanno-Reuter at the 1% level.
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Gravitational Atoms from Topological Stars
Bound states of a massive scalar field around topological stars form strictly normal modes, producing a hydrogen-like spectrum when the Compton wavelength exceeds the star size and localized states otherwise.
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Tests of General Relativity with Binary Black Holes from the second LIGO-Virgo Gravitational-Wave Transient Catalog
No evidence for deviations from general relativity is found in LIGO-Virgo binary black hole events, with improved constraints on waveform parameters, graviton mass, and ringdown properties.
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Interior Dynamics of Regular Schwarzschild Black Holes
Dynamical evolution of Schwarzschild black holes produces new interior singularities absent in the static case, with resolution imposing highly restrictive conditions on gravitational collapse.