Head-on collisions of black holes: The particle limit

被引:78
作者
Lousto, CO
Price, RH
机构
[1] Department of Physics, University of Utah, Salt Lake City, UT
来源
PHYSICAL REVIEW D | 1997年 / 55卷 / 04期
关键词
D O I
10.1103/PhysRevD.55.2124
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We compute gravitational radiation waveforms, spectra, and energies for a point particle of mass m(0) falling from rest at radius r(0) into a Schwarzschild hole of mass M. This radiation is found to lowest order in (m(0)/M) with the use of a Laplace transform. In contrast with numerical relativity results for head-on collisions of equal-mass holes, the radiated energy is found not to be a monotonically increasing function of initial separation; there is a local radiated-energy maximum at r(0) approximate to 4.5M. The present results, along with results for infall from infinity, provide a complete catalog of waveforms and spectra for particle infall. We give a representative sample from that catalog and an interesting observation: Unlike the simple spectra for other head-on collisions (either of particle and hole, or of equal mass holes) the spectra for infinity>r(0)>similar to 5M show a series of evenly spaced bumps. A simple explanation is given for this. Lastly, our energy versus r(0) results are compared with approximation methods used elsewhere, for small and for large initial separation.
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页码:2124 / 2138
页数:15
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