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

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

2008-01-17

arxiv.org/abs/0801.2750v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 1 figure, prepared for the proceedings of the 17th workshop on general relativity and gravitation, Nagoya, Japan, Dec

Scientific paper

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.

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