New method to integrate 2+1 wave equations with Dirac's delta functions as sources

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Nakano, Hiroyuki
Lousto, Carlos O.
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Abstract
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Gravitational perturbations in a Kerr black hole background can not be decomposed into simple tensor harmonics in the time domain. Here, we make the mode decomposition only in the azimuthal direction and discuss the resulting (2+1)-dimensional Klein-Gordon differential equation for scalar perturbations with a two dimensional Dirac's $\delta$-function as a source representing a point particle orbiting a much larger black hole. To make this equation amenable for numerical integrations we explicitly remove analytically the singular behavior of the source and compute a global effective source for the corresponding waveform.
Comment: 4 pages, 1 figure, prepared for the proceedings of the 17th workshop on general relativity and gravitation, Nagoya, Japan, Dec.3 - Dec.7, 2007
Keywords
General Relativity and Quantum Cosmology
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