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FIZIKA B 15 (2006) 3, 99-106
 
PERIASTRON SHIFT IN THE ORBIT OF A PARTICLE ORBITING
A KERR BLACK HOLE
S. B. FARUQUE1 and SH. HUDA
Department of Physics, Shah Jalal University of Science and Technology,
Sylhet 3114, Bangladesh
1E-mail address: awsbf62@yahoo.com
Received 2 October 2005; Accepted 25 September 2006
Online 29 December 2006
In this paper, we present a simple calculation of periastron shift
in the orbit of a test particle in the Kerr field. We differentiate
the prograde and retrograde orbits by the orbital angular momentum
of the test particle. The orbit equations are then clearly
different for the two types of motion. The calculated periastron
shift is larger in a retrograde orbit than in a prograde orbit, a
fact confirming previous results. We compare the difference
between periastron shifts in the two types of motion with the
results of Esteban and Diaz who used elliptic integrals to
calculate the shift.
PACS numbers: 04.20.Cv, 04.25.-g
UDC 521.184
Keywords: periastron shift, Kerr field, prograde and retrograde orbits
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