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Black hole perturbation in parity violating gravitational theories
Black hole perturbation parity violating gravitational theories
2011/10/14
We study linear perturbations around the static and spherically symmetric spacetime for the gravitational theories whose Lagrangian depends on Ricci scalar and the parity violating Chern-Simons term. ...
Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
waterfall transition black hole constraints non-Gaussianity
2011/10/11
We carried out numerical calculations of a contribution of the waterfall field to the primordial curvature perturbation (on uniform density hypersurfaces) $\zeta$, which is produced during waterfall t...
Violation of the first law of black hole thermodynamics in $f(T)$ gravity
Violation first law black hole thermodynamics $f(T)$ gravity
2011/10/18
We prove that the first law of black hole thermodynamics, $\delta Q=T\delta S$, is violated in $f(T)$ gravity. As a result, there always exists entropy production, which implies that the black hole th...
Black Hole in Binary System is the Source of Cosmic Gamma-Ray Bursts and Their Counterparts
Accretion Disks, Binaries, Black Hole Physics, Gamma-Rays Bursts, Relativity
2011/9/15
Discovery of GRB clusters allows us to determine coordinates and characteristics of their sources. The objects radiating GRBs are reliably identified with black hole binaries, including the Galactic b...
Collision of an innermost stable circular orbit particle around a Kerr black hole
innermost stable circular orbit particle Kerr black hole
2011/1/13
We derive a general formula for the center-of-mass (CM) energy for the near-horizon collision of two particles of the same rest mass on the equatorial plane around a Kerr black hole. We then apply thi...
Extremal energy shifts of radiation from a ring near a rotating black hole
Extremal energy rotating black hole
2011/1/11
Radiation from a narrow circular ring shows a characteristic double-horn profile dominated by photons having energy around the maximum or minimum of the allowed range, i.e. near the extremal values of...
Extremal energy shifts of radiation from a ring near a rotating black hole
Extremal energy shifts radiation black hole
2011/1/11
Radiation from a narrow circular ring shows a characteristic double-horn profile dominated by photons having energy around the maximum or minimum of the allowed range, i.e. near the extremal values of...
Formation of the black-hole binary M33 X-7 via mass-exchange in a tight massive system
the black-hole binary M33 X-7 via mass-exchange
2011/1/10
M33 X-7 is among the most massive X-Ray binary stellar systems known, hosting a rapidly spinning 15.65 Msun black hole orbiting an underluminous 70 Msun Main Sequence companion in a slightly eccentric...
The role of flow geometry in influencing the stability criteria for low angular momentum axisymmetric black hole accretion
the stability criteria low angular momentum axisymmetric black hole accretion
2011/1/11
Using mathematical formalism borrowed from dynamical systems theory, a complete analytical investigation of the critical behaviour of the stationary flow configuration for the low angular momentum axi...
The intriguing evolutionary history of the massive black hole X-ray binary M33 X-7
The intriguing evolutionary history black hole
2011/1/10
Black hole (BH) X-ray binaries (XRBs) are X-ray luminous binary systems comprising a BH accreting matter from a companion star. Understanding their origins sheds light on the still not well understood...
Black Hole Formation in Failing Core-Collapse Supernovae
Black Hole Formation Core-Collapse Supernovae
2011/1/11
We present results of a systematic study of failing core-collapse supernovae and the formation of stellar-mass black holes (BHs). Using our open-source general-relativistic 1.5D code GR1D equipped wit...
A Precision Test for an Extra Spatial Dimension Using Black Hole--Pulsar Binaries
Extra Spatial Dimension Black Hole Pulsar Binaries
2011/1/11
We discuss the observable effects of enhanced black-hole mass loss in a black hole--neutron star (BH--NS) binary, due to the presence of a warped extra spatial dimension of curvature radius $L$ in the...
Spectral Index as a Function of Mass Accretion Rate in Black Hole Sources. Monte-Carlo Simulations and an Analytical Description
black hole physics accretion disks radiation mechanisms
2010/11/16
We present herein a theoretical study of correlations between spectral indexes of X-ray emergent spectra and mass accretion rate (m˙ ) in black hole (BH) sources,which provide a definitive signature f...
Estimating the parameters of the Sgr A* black hole
Black Holes Galactic Center Gravitational Lensing Strong
2010/11/11
The measurement of relativistic effects around the galactic center may allow in the near future to strongly constrain the parameters of the supermassive black hole likely present at the galactic cente...
Evidence for Low Black Hole Spin and Physically Motivated Accretion Models from Millimeter VLBI Observations of Sagittarius A*
black hole physics—Galaxy center—techniques interferometric—submillimeter—accretion accretion
2010/11/15
Millimeter very-long baseline interferometry (mm-VLBI) provides the novel capacity to probe the emission region of a handful of supermassive black holes on sub-horizon scales. For Sagittarius A* (Sgr ...