Hyperboloidal slices for the wave equation of Kerr-Schild metrics and numerical applications

Details Hyperboloidal slices for the wave equation of Kerr-Schild metrics and numerical applications Hyperboloidal slices for the wave equation of Kerr-Schild metrics and numerical applications

2011-09-12

arxiv.org/abs/1109.2513v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 12 figures

Scientific paper

We present new results from two codes, using finite differencing and pseudo-spectral methods for the wave equations in (3+1) dimensions. We use a hyperboloidal transformation which allows direct access to null infinity and simplifies the control over characteristic speeds on Kerr-Schild backgrounds. We show that this method is ideal for attaching hyperboloidal slices or for adapting the numerical resolution in certain spacetime regions. As an example application, we study late-time Kerr tails of sub-dominant modes and obtain new insight into the splitting of decay rates. The involved conformal wave equation is freed of formally singular terms whose numerical evaluation might be problematically close to future null infinity.

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