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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. ...
Acceleration of particles by black holes -- general explanation
Acceleration of particles black holes -- general explanation
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2010/12/17
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...
Head-on collisions of unequal mass black holes in D=5 dimensions
Head-on collisions of unequal mass black holes D=5 dimensions
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2010/12/20
We study head-on collisions of unequal mass black hole binaries in D = 5 spacetime dimensions,
with mass ratios between 1:1 and 1:4. Information about gravitational radiation is extracted by
using t...
Lurking at the centre of nearly every galaxy and gobbling up stars in their vicinity, supermassive black holes are a truly menacing feature of the universe. Now, an international team of astronomers c...
What are 'mini' black holes?（图）
black holes the Large Hadron Collider unwary spaceships and planets
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2010/4/29
In films and books black holes capture unwary spaceships and planets, gobble up whole galaxies or offer portals to other parts of the Universe.So the idea that, with the start of the Large Hadron Coll...
Particle Accelerators inside Spinning Black Holes
Particle Accelerators Spinning Black Holes
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2010/3/18
On the basis of the Kerr metric as a model for a spinning black hole accreting test particles from rest at infinity, I show that the center-of-mass energy for a pair of colliding particles is generica...
An instability of higher-dimensional rotating black holes
higher-dimensional black holes
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2010/3/19
We present the first example of a linearized gravitational instability of an asymptotically flat vacuum black hole. We study perturbations of a Myers-Perry black hole with equal angular momenta in an ...
Topological geon black holes in Einstein-Yang-Mills theory
Topological geon black holes Einstein-Yang-Mills theory
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2010/3/18
We construct topological geon quotients of two families of Einstein-Yang-Mills black holes. For Kuenzle's static, spherically symmetric SU(n) black holes with n>2, a geon quotient exists but generical...
Evolution of near-extremal-spin black holes using the moving puncture technique
near-extremal-spin black holes puncture technique
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2010/3/18
We propose a new radial coordinate to write the Kerr metric in puncture form. Unlike the quasi-radial coordinate introduced previously, the horizon radius remains finite in our radial coordinate in th...
On Classical Analogs of Quantum Schwarzschild and Reissner-Nordstrom Black Holes. Solving the "Mystery of log(3)"
Black Holes Quantum Schwarzschild
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2010/3/18
The model is built in which the main global properties of classical and quasi-classical black holes become local. These are the event horizon, "no-hair", temperature and entropy. Our construction is b...
Entropy Conservation of Linear Dilaton Black Holes in Quantum Corrected Hawking Radiation
Entropy Conservation Linear Dilaton Black Holes Quantum Corrected
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2010/3/18
It has been shown recently that information is lost in the Hawking radiation of the linear dilaton black holes in various theories when applying the tunneling formulism without considering quantum gra...
We calculate intensity of thermal radiation (via Hawking effect) and evaporation time of a stationary nonrotating black hole using Kirchhoff's law and the electrodynamic membrane paradigm. It is shown...
Charged anti-de Sitter scalar-tensor black holes and their thermodynamic phase structure
scalar-tensor black holes thermodynamic phase structure
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2010/3/18
In the present paper we numerically construct new charged anti-de Sitter black holes coupled to nonlinear Born-Infeld electrodynamics within a certain class of scalar-tensor theories. The properties o...
Solar System tests of Hořava-Lifshitz black holes
Solar System Hoř ava-Lifshitz black holes
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2010/3/18
In the present paper we consider the possibility of observationally testing Horava gravity at the scale of the Solar System, by considering the classical tests of general relativity (perihelion preces...
Charged black holes in Vaidya backgrounds: Hawking's Radiation
Reissner-Nordstrom-Vaidya Kerr-Newman-Vaidya black hole ro-tating Vaidya surface gravity Hawking’s radiation
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2010/3/17
In this paper we propose a class of embedded solutions of Einstein's field equations describing non-rotating Reissner-Nordstrom-Vaidya and rotating Kerr-Newman-Vaidya black holes.