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Entropy of extremal black holes from entropy of quasiblack holes
quasiblack holes black holes extremal horizon entropy thermodynamics
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2010/12/20
The entropy of extremal black holes (BHs) is obtained using a continuity argument from extremal quasiblack holes (QBHs). It is shown that there exists a smooth limiting transition in which (i) the sys...
Perturbative effects of spinning black holes with applications to recoil velocities
Perturbative effects of spinning black holes applications recoil velocities
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2010/12/20
Recently, we proposed an enhancement of the Regge-Wheeler-Zerilli formalism for first-order perturbations about a Schwarzschild background that includes first-order corrections due to the background b...
Single-charge rotating black holes in four-dimensional gauged supergravity
Single-charge black holes four-dimensional gauged supergravity
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2010/12/21
We consider four-dimensional U(1)4 gauged supergravity, and obtain asymptotically AdS4,
non-extremal, charged, rotating black holes with one non-zero U(1) charge. The thermodynamic
quantities are co...
Accretion Disks Around Binary Black Holes: A Quasistationary Model
ProAccretion Disks Binary Black Holes Quasistationary Model
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2010/11/9
Tidal torques acting on a gaseous accretion disk around a binary black hole can create a gap in the disk near the orbital radius. At late times, when the binary inspiral timescale due to gravitational...
Retrograde Accretion and Merging Supermassive Black Holes
accretion accretion discs black hole physics galaxies formation – galaxies
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2010/11/12
We investigate whether a circumbinary gas disc can coalesce a supermassive black hole
binary system in the centre of a galaxy. This is known to be problematic for a prograde disc.
We show that in co...
Quasinormal modes, scattering and Hawking radiation of Kerr-Newman black holes in a magnetic field
Quasinormal modes Kerr-Newman black holes magnetic field
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2010/12/20
We perform a comprehensive analysis of the spectrum of proper oscillations (quasinormal modes),
transmission/reflection coefficients and Hawking radiation for a massive charged scalar field in the ba...
Ultraspinning instability of anti-de Sitter black holes
instability anti-de Sitter black holes
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2010/12/21
Myers-Perry black holes with a single spin in d > 5 have been shown to be unstable if
rotating suciently rapidly. We extend the numerical analysis which allowed for that result
to the asymptoticall...
A local characterisation for static charged black holes
local characterisation static charged black holes
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2010/12/20
We obtain a purely local characterisation that singles out the Majumdar-Papapetrou class, the near-horizon Bertotti-Robinson geometry and the Reissner-Nordstr¨om exterior solution, together with its p...
Acceleration of particles by black holes -- general explanation
Acceleration black holes general explanation
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2010/11/16
We give simple and general explanation to the effect of unbound acceleration of particles by black holes. It is related to the fact that the scalar product of a timelike vector of the four-velocity of...
In this paper, we classify and construct five-dimensional black holes on gravitational instantons in vacuum Einstein gravity, with R × U(1) × U(1) isometry. These black holes have
spatial backgrounds...
Universal Area Product Formulae for Rotating and Charged Black Holes in Four and Higher Dimensions
Universal Area Product Formulae Black Holes Higher Dimensions
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2010/12/21
We present explicit results for the product of all horizon areas for general rotating multi-charge black holes, both in asymptotically flat and asymptotically anti-de Sitter spacetimes in four and hig...
Universal Area Product Formulae for Rotating and Charged Black Holes in Four and Higher Dimensions
Product Formulae Rotating Charged Black Holes
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2010/12/22
We present explicit results for the product of all horizon areas for general rotating multi-charge black holes, both in asymptotically flat and asymptotically anti-de Sitter spacetimes in four and hig...
Search of sub-parsec massive binary black holes through line diagnosis
sub-parsec binary black holes
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2011/1/10
We investigate on the spectral properties of an active black hole, member of a massive (10^7 - 10^9 Msun) sub-parsec black hole binary. We work under the hypothesis that the binary, surrounded by a ci...
Properties of Accretion Flows Around Coalescing Supermassive Black Holes
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc)
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2010/12/29
What are the properties of accretion flows in the vicinity of coalescing supermassive black holes (SBHs)? The answer to this question has direct implications for the feasibility of coincident detectio...
Cosmological evolution of massive black holes: effects of Eddington ratio distribution and quasar lifetime
Galaxy Astrophysics (astro-ph.GA)
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2010/12/22
A power-law time-dependent lightcurve for active galactic nuclei (AGNs) is expected by the self-regulated black hole growth scenario, in which the feedback of AGNs expels gas and shut down accretion. ...