37 research outputs found
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Inside an asymptotically flat hairy black hole
We study the interior of a recently constructed family of asymptotically
flat, charged black holes that develop (charged) scalar hair as one increases
their charge at fixed mass. Inside the horizon, these black holes resemble the
interior of a holographic superconductor. There are analogs of the Josephson
oscillations of the scalar field, and the final Kasner singularity depends very
sensitively on the black hole parameters near the onset of the instability. In
an Appendix, we give a general argument that Cauchy horizons cannot exist in a
large class of stationary black holes with scalar hair
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Constraining the mass of dark photons and axion-like particles through black-hole superradiance
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Non-axisymmetric instability of rotating black holes in higher dimensions
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Stirring a black hole
We present novel asymptotically global AdS4 solutions, constructed by turning on a dipolar differential rotation at the conformal boundary. At fixed energy and boundary profile, we find two different geometries: a horizonless spacetime, and a deformed, hourglass shaped black hole with zero net angular momentum. Both solutions exist up to some maximum amplitudes of the boundary profile, and develop an ergoregion attached to the boundary before the maximum amplitude is reached. We show that both spacetimes develop hair as soon as the ergoregion develops. Furthermore, we discuss the full phase diagram, including the possibility of phases with disconnected horizons, by considering the Mathisson-Papapetrou equations for a spinning test particle. Finally, we provide a first principle derivation of the superradiant bound purely from CFT data, and outline possible scenarios for the late time evolution of the system.JM is supported by an STFC studentship. JES was supported in part by STFC grants PHY-1504541 and ST/P000681/1 ... The authors thankfully acknowledge the computer resources, technical expertise and assistance provided by CENTRA/IST. Part of the computations were performed at the cluster \Baltasar-Sete-S ois" and supported by the H2020 ERC Consolidator Grant \Matter and strong eld gravity: New frontiers in Einstein's theory" grant agreement no. MaGRaTh-646597. Part of this work was undertaken on the COSMOS Shared Memory system at DAMTP, University of Cambridge operated on behalf of the STFC DiRAC HPC Facility. This equipment is funded by BIS National E-infrastructure capital grant ST/J005673/1 and STFC grants ST/H008586/1, ST/K00333X/1
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Black droplets
Black droplets and black funnels are gravitational duals to states of a large N, strongly coupled CFT on a fixed black hole background. We numerically construct black droplets corresponding to a CFT on a Schwarzchild background with finite asymptotic temperature. We find two branches of such droplet solutions which meet at a turning point. Our results suggest that the equilibrium black droplet solution does not exist, which would imply that the Hartle-Hawking state in this system is dual to the black funnel constructed in [1]. We also compute the holographic stress energy tensor and match its asymptotic behaviour to perturbation theory. © 2014 The Author(s).J.E.S.’s work is partially supported by the John Templeton Foundation. B.W. was supported by European Research Council grant no. ERC-2011-StG 279363-HiDGR