Nonequatorial tachyon trajectories in Kerr space-time and the second law of black-hole physics

1979 ◽  
Vol 19 (8) ◽  
pp. 2310-2319 ◽  
Author(s):  
S. V. Dhurandhar
Keyword(s):  
Black Hole ◽  
Black Hole Physics ◽  
Space Time ◽  
Second Law ◽  
Kerr Space

Tachyons and the second law of black hole physics

1978 ◽  
Vol 9 (12) ◽  
pp. 1089-1100 ◽  
Author(s):  
S. V. Dhurandhar ◽  
J. V. Narlikar
Keyword(s):  
Black Hole ◽  
Black Hole Physics ◽  
Second Law

scholarly journals Shadow of a Kerr-like black hole

2014 ◽  
Vol 10 (S312) ◽  
pp. 135-136
Author(s):  
Farruh Atamurotov
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Deformation Parameter ◽  
Space Time ◽  
Black Hole Spin ◽  
Spin Parameter ◽  
Kerr Space ◽  
The One

AbstractThe shadow of a Kerr-like black hole has been considered and it was shown that in addition to the specific angular momentum a, deformation parameter of Kerr-like space-time essentially deforms the shape of the black hole shadow. For a given value of the black hole spin parameter a, the presence of a deformation parameter ε reduces the shadow and enlarges its deformation with respect to the one in the Kerr space-time.

The gravitational perturbations of the Kerr black hole IV. The completion of the solutiont

1980 ◽  
Vol 372 (1751) ◽  
pp. 475-484 ◽  
Keyword(s):  
Black Hole ◽  
Kerr Black Hole ◽  
Space Time ◽  
Gravitational Perturbations ◽  
Kerr Space ◽  
The One

This paper eliminates the last remaining lacuna in the information that was needed to make the solution for the perturbations in the metric coefficients of the Kerr space-time fully explicit. The requisite information is obtained from a pair of equations which is complementary to the one considered in paper III; and the solution of the Newman-Penrose equations governing the perturbations is, thus, completed.

scholarly journals Efficient gravitational lens optical scalars calculation of black holes with angular momentum

2019 ◽  
Vol 492 (3) ◽  
pp. 3763-3778
Author(s):  
Ezequiel F Boero ◽  
Osvaldo M Moreschi
Keyword(s):  
Black Hole ◽  
Null Geodesic ◽  
Space Time ◽  
Gravitational Lens ◽  
Hidden Symmetries ◽  
Kerr Geometry ◽  
Deviation Equation ◽  
Efficient Calculation ◽  
Efficient Integration ◽  
Kerr Space

ABSTRACT We provide new very simple and compact expressions for the efficient calculation of gravitational lens optical scalars for Kerr space–time, which are exact along any null geodesic. These new results are obtained recurring to well-known results on geodesic motion that exploit obvious and hidden symmetries of Kerr space–time and contrast with the rather long and cumbersome expressions previously reported in the literature, providing a helpful improvement for the sake of an efficient integration of the geodesic deviation equation on Kerr geometry. We also introduce a prescription for the observer frame that captures a new notion of centre of the black hole, which can be used for any position of the observer, including those near the black hole. We compare the efficient calculation of weak lens optical scalars with the exact equations, finding an excellent agreement.

Violation of the second law of black hole physics by tachyons

Pramana ◽  
1982 ◽  
Vol 19 (4) ◽  
pp. 357-366
Author(s):  
K C Das
Keyword(s):  
Black Hole ◽  
Black Hole Physics ◽  
Second Law
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