The properties of the first generation of black-hole seeds trace and distinguish different models of formation of cosmic structures in the high-redshift universe. The observational challenge lies in identifying black holes in the mass range ∼ 100 − 1000M⊙ at redshift z ∼ 10. Here we show that future groundbased laser interferometers could observe gravitational waves produced by the coalescence ...

In this letter we show that the approach of Carathéodory to thermodynamics by means of Pfaffian forms can be applied to black hole thermodynamics and strongly links black hole thermodynamics to the standard thermodynamic formalism. The Pfaffian form δQrev ≡ dM − Ω dJ − Φ dQ, which is assumed to be the infinitesimal heat exchanged reversibly, is shown to be integrable; moreover, we show that it ...

We obtain the quasinormal modes for tensor perturbations of Gauss-Bonnet black holes in d = 5, 7, 8 dimension using third order WKB formalism. The black hole in d = 6 is not considered because of the fact that it is unstable to tensor mode perturbations. For the uncharged Gauss-Bonnet black hole the real part of the frequency increases as the GaussBonnet coupling (α) increases. The imaginary pa...

We discuss an evaporation of (2+1)-dimensional black hole by using quantum gravity holding in the vicinity of the black hole horizon. It is shown that the black hole evaporates at a definite rate by emitting matters through the quantum tunneling effect. A relation of the present formalism to the black hole entropy is briefly commented. † E-mail address: [email protected] The canonical...

TeV scale gravity scenario predicts that the black hole production dominates over all other interactions above the scale and that the Large Hadron Collider will be a black hole factory. Such higher dimensional black holes mainly decay into the standard model fields via the Hawking radiation whose spectrum can be computed from the greybody factor. Here we complete the series of our work by showi...

In our program of studying numerically the so-called Bondi-Hoyle accretion in the fully relativistic regime, we present here first results concerning the evolution of matter accreting supersonically onto a rotating (Kerr) black hole. These computations generalize previous results where the non-rotating (Schwarzschild) case was extensively considered. We parametrize our initial data by the asymp...

We consider the duality of the quasilocal black hole thermodynamics, explicitly the quasilocal black hole thermodynamic first law, in BTZ black hole solution as a special one of the three-dimensional low energy effective string theory. E-mail address : [email protected] E-mail address : [email protected] E-mail address : [email protected] 1

Charged black hole solutions with pion hair are discussed. These can be used to study monopole black hole catalysis of proton decay. There also exist multi-black hole skyrmion solutions with BPS monopole behaviour. Pacs numbers: 0470D, 0420J, 1239D Typeset using REVTEX email: [email protected] email: [email protected] email: [email protected] 1

If a Kerr black hole is connected to a disk rotating around it by a magnetic field, the rotational energy of the Kerr black hole provides an energy source for the radiation of the disk in addition to disk accretion. The black hole exerts a torque on the disk, which transfers energy and angular momentum between the black hole and the disk. If the black hole rotates faster than the disk, energy a...

Black holes, objects so compact that not even light can escape their gravitational pull, are among the most intriguing concepts of modern science. As Kip Thorne wrote in 1974: “Of all the conceptions of the human mind from unicorns to gargoyles to the hydrogen bomb perhaps the most fantastic is the black hole: a hole in space with a definite edge over which anything can fall and nothing can esc...