A Kerr black hole in the external gravitational field

1997 ◽  
Vol 230 (1-2) ◽  
pp. 7-11 ◽  
Author(s):  
Nora Bretón ◽  
Tatiana E. Denisova ◽  
Vladimir S. Manko
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Kerr Black Hole ◽  
External Gravitational Field

Bound orbits around modified Hayward black holes

2021 ◽  
Author(s):  
Bo Gao ◽  
Xue-Mei Deng
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Angular Momentum ◽  
Gravitational Field ◽  
Periodic Orbits ◽  
Kerr Black Hole ◽  
Periodic Oscillations ◽  
Test Particles ◽  
Spin Parameter ◽  
Bound Orbits

The neutral time-like particle’s bound orbits around modified Hayward black holes have been investigated. We find that both in the marginally bound orbits (MBO) and the innermost stable circular orbits (ISCO), the test particle’s radius and its angular momentum are all more sensitive to one of the parameters [Formula: see text]. Especially, modified Hayward black holes with [Formula: see text] could mimic the same ISCO radius around the Kerr black hole with the spin parameter up to [Formula: see text]. Small [Formula: see text] could mimic the ISCO of small-spinning test particles around Schwarzschild black holes. Meanwhile, rational (periodic) orbits around modified Hayward black holes have also been studied. The epicyclic frequencies of the quasi-circular motion around modified Hayward black holes are calculated and discussed with respect to the observed Quasi-periodic oscillations (QPOs) frequencies. Our results show that rational orbits around modified Hayward black holes have different values of the energy from the ones of Schwarzschild black holes. The epicyclic frequencies in modified Hayward black holes have different frequencies from Schwarzschild and Kerr ones. These might provide hints for distinguishing modified Hayward black holes from Schwarzschild and Kerr ones by using the dynamics of time-like particles around the strong gravitational field.

scholarly journals Myers-Perry black hole in an external gravitational field

2015 ◽  
Vol 91 (6) ◽  
Author(s):  
Shohreh Abdolrahimi ◽  
Jutta Kunz ◽  
Petya Nedkova
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
External Gravitational Field

scholarly journals On the stability of the scalar field in the gravitational field of a rotating (Kerr-) black hole

2010 ◽  
Author(s):  
Reinhard Horst Beyer ◽  
H. A. Morales-Tecotl ◽  
L. A. Urena-Lopez ◽  
R. Linares-Romero ◽  
H. H. Garcia-Compean
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Scalar Field ◽  
Kerr Black Hole ◽  
The Stability

Black holes and thermal Green functions

1978 ◽  
Vol 358 (1695) ◽  
pp. 467-494 ◽  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Field ◽  
Energy Density ◽  
Thermal Equilibrium ◽  
Heat Bath ◽  
High Energy ◽  
High Energy Density ◽  
Green Functions ◽  
External Gravitational Field

This paper concerns itself with the possibility of thermal equilibrium between a black hole and a heat bath implied by Hawking’s discovery of black hole emission. We argue that in an isolated box of radiation, for sufficiently high energy density a black hole will condense out. We introduce thermal Green functions to discuss this equilibrium and are able to extend the original arguments, that the equilibrium is possible based on fields interacting solely with the external gravitational field, to the case when mutual and self interactions are included.

scholarly journals Time delay of radiation from pulsar in a binary system that moves in field of Schwarzschild black hole

2017 ◽  
Vol 57 (2) ◽  
Author(s):  
Stanislav Komarov ◽  
Alexander Gorbatsievich ◽  
Alexander Tarasenko
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Time Delay ◽  
Binary System ◽  
Binary Star ◽  
Schwarzschild Black Hole ◽  
External Gravitational Field ◽  
Compact Binary

A compact binary star that moves in a strong external gravitational field of a Schwarzschild black hole is considered. Decomposition of the redshift into a series with respect to the size of the binary system is obtained. This expression is used to calculate the redshift for a model binary system. Possible application of the results is discussed.

GRAVITOMAGNETISM AND THE BERRY PHASE OF PHOTON IN AN ROTATING GRAVITATIONAL FIELD

2001 ◽  
Vol 10 (06) ◽  
pp. 961-969 ◽  
Author(s):  
LONG-LONG FENG ◽  
WOLUNG LEE
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Berry Phase ◽  
Optical Rotation ◽  
Polarized Light ◽  
Kerr Black Hole ◽  
Optical Path ◽  
Zeroth Order ◽  
Helicity State ◽  
Two Factors

In this paper, we present an investigation of the Berry phase that a photon acquired during its propagating through a gravitational field produced by a Kerr black hole. Starting from the Maxwell equation in Kerr–Schild metric form of Kerr black hole, we give the zeroth order Hamiltonian of the photon under geometric optics approximation. The helicity state of the photon is then derived. We demonstrate that there are two factors leading to the Berry phase that the photon acquires in a gravitational field. These are the adiabatic transport of the local comoving tetrad and the rotation of the equivalent magnetic field that we introduce. The straightforward calculation show that the appearance of Berry phase is attributed to the twisted optical path due to the rotation of black hole. It is in fact analogous to the observed optical rotation for a linear polarized light propagating in an helical optical fiber.

The electron in the gravitational field of the Kerr black hole

2001 ◽  
Vol 10 (6) ◽  
pp. 475-479 ◽  
Author(s):  
Wang Yong-jiu ◽  
Tang Zhi-ming
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Kerr Black Hole

Apparent velocities of sources moving in the gravitational field of a Kerr black hole

1988 ◽  
Vol 330 ◽  
pp. 168
Author(s):  
Shou-Ping Xiang ◽  
Tao Kiang ◽  
Jia-Lu Zhang
Keyword(s):  
Black Hole ◽  
Gravitational Field ◽  
Kerr Black Hole

scholarly journals Kerr-Taub-NUT General Frame, Energy, and Momentum in Teleparallel Equivalent of General Relativity

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Gamal G. L. Nashed
Keyword(s):  
Exact Solution ◽  
General Relativity ◽  
Black Hole ◽  
Gravitational Field ◽  
Total Energy ◽  
Kerr Black Hole ◽  
Gravitational Energy ◽  
Axially Symmetric ◽  
Riemannian Connection ◽  
Energy And Momentum

A new exact solution describing a general stationary and axisymmetric object of the gravitational field in the framework of teleparallel equivalent of general relativity (TEGR) is derived. The solution is characterized by three parameters “the gravitational massM, the rotationa, and the NUTL.” The vierbein field is axially symmetric, and the associated metric gives the Kerr-Taub-NUT spacetime. Calculation of the total energy using two different methods, the gravitational energy momentum and the Riemannian connection 1-formΓα̃β, is carried out. It is shown that the two methods give the same results of energy and momentum. The value of energy is shown to depend on the massMand the NUT parameterL. IfLis vanishing, then the total energy reduced to the energy of Kerr black hole.

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