Journal ArticleDOI
Black hole in a uniform magnetic field
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In this paper, the authors derived the solution for the electromagnetic field occurring when a stationary, axisymmetric black hole is placed in an originally uniform magnetic field aligned along the symmetry axis of the black hole.Abstract:
Using the fact that a Killing vector in a vacuum spacetime serves as a vector potential for a Maxwell test field, we derive the solution for the electromagnetic field occurring when a stationary, axisymmetric black hole is placed in an originally uniform magnetic field aligned along the symmetry axis of the black hole. It is shown that a black hole in a magnetic field will selectively accrete charges until its charge becomes $Q=2{\mathrm{Bb}}_{0}J$, where ${B}_{0}$ is the strength of the magnetic field and $J$ is the angular momentum of the black hole. As a by-product of the analysis given here, we prove that the gyromagnetic ratio of a slightly charged, stationary, axisymmetric black hole (not assumed to be Kerr) must have the value $g=2$.read more
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Journal ArticleDOI
Ergoregions in magnetized black hole spacetimes
TL;DR: In this paper, the authors show that unless the electric charge of a seed Kerr-Newman black hole satisfies, where j is the angular momentum of the original seed solution, an ergoregion extends all the way from the black hole horizon to infinity.
Journal ArticleDOI
Gravitational radiation from gamma-ray bursts as observational opportunities for LIGO and VIRGO
Maurice H. P. M. van Putten,Amir Levinson,Amir Levinson,Hyun Lee,Tania Regimbau,M. Punturo,Gregory M. Harry +6 more
TL;DR: In this article, the authors quantify black hole spin-interactions with the torus and charged particles along open magnetic flux-tubes subtended by the event horizon, and find that the major output of Egw=4e53 erg is radiated in gravitational waves of frequency fgw=500 Hz by a quadrupole mass-moment in a uniformly magnetized torus represented by two counteroriented current rings.
Journal ArticleDOI
Environmental Effects for Gravitational-wave Astrophysics
TL;DR: In this article, the main sources for space-based detectors -the inspiral, merger and ringdown of massive black-hole binaries and extreme mass-ratio inspirals -and account for various effects on their gravitational waveforms, including electromagnetic fields, cosmological evolution, accretion disks, dark matter, "firewalls" and possible deviations from General Relativity.
BookDOI
Superradiance -- the 2020 Edition
TL;DR: Black-hole superradiance has played a prominent role in optics, quantum mechanics and especially in relativistic and astrophysics as discussed by the authors, and has been studied in the laboratory by devising analog models of gravity, and might even provide a holographic description of spontaneous symmetry breaking.
Journal ArticleDOI
Supermassive Black Holes as Possible Sources of Ultrahigh-energy Cosmic Rays
TL;DR: In this paper, it was shown that large factors of high-energy particles along the escaping directions occur only in the presence of induced charge of the supermassive black hole that is known as the Wald charge in the case of uniform magnetic field.
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