[1008.3324] Gravitational Radiations from a Spinning Compact Object circling a Supermassive Kerr Black Hole

Authors: Wen-Biao Han

Date: 19 Aug 2010

Abstract: The gravitational waves and energy radiations from a spinning compact object with stellar mass in a circular orbit in the equatorial plane of a supermassive Kerr black hole are investigated in this paper. The effect how the spin acts on energy and angular moment fluxes is discussed in detail. The calculation results indicate that the spin of small body should be considered in waveform-template production for the upcoming gravitational wave detections. It is clear that when the direction of spin axes is as same as the orbitally angular momentum (‘positive’ spin), spin can decrease the energy fluxes which radiate to infinity. For anti-direction spin (‘negative’), the energy fluxes to infinity be enlarged. And the relation between fluxes (both infinity and horizon) and spin looks like a quadratic function. From frequency shift due to spin, we estimate the wave-phase accumulation during inspiralling process of the particle. We find that the time of particle inspiral into the black hole is longer for ‘positive’ spin and shorter for ‘negative’ comparing with non-spinning particle. Especially, for extreme spin value, the energy radiation near the horizon of the extreme Kerr black hole is much more than the non-spinning one. And consequently, the maximum binging energy of the extreme spinning particle is much bigger than the non-spinning particle.

abs pdf

Aug 20, 2010

1008.3324 (/preprints)
2010-08-20, 08:30 [edit]


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