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Geodesic motion around a distorted static black hole

Dec 4, 2015

13 pages

Published in:

Phys.Rev.D 93 (2016) 6, 064019

Published: Mar 7, 2016

e-Print:

1512.01566 [gr-qc]

DOI:

10.1103/PhysRevD.93.064019

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Abstract: (APS)

In this paper we study geodesic motion around a distorted Schwarzschild black hole. We consider both timelike and null geodesics which are confined to the black hole’s equatorial plane. Such geodesics generically exist if the distortion field has only even interior multipole moments, and so the field is symmetric with respect to the equatorial plane. We specialize to the case of distortions defined by a quadrupole Weyl moment. An analysis of the effective potential for equatorial timelike geodesics shows that finite stable orbits outside the black hole are possible only for q∈(qmin,qmax], where qmin≈-0.0210 and qmax≈2.7086×10-4, while for null equatorial geodesics a finite stable orbit outside the black hole is possible only for q∈[qmin,0). Moreover, the innermost stable circular orbits are closer to the distorted black hole horizon than those of an undistorted Schwarzschild black hole for q∈(qmin,0), and a null innermost stable circular orbit exists for q=qmin. These results show that an external distortion of a negative and sufficiently small quadrupole moment tends to stabilize the motion of massive particles and light.

Note:

12 pages and 12 figures

04.20.Jb
04.70.-s
04.70.Bw
black hole: Schwarzschild
orbit: stability
black hole: horizon
black hole: static
particle: massive
geodesic
moment

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