Second order gauge invariant gravitational perturbations of a Kerr black hole

Details Second order gauge invariant gravitational perturbations of a Kerr black hole Second order gauge invariant gravitational perturbations of a Kerr black hole

1998-11-05

arxiv.org/abs/gr-qc/9811019v2

Phys.Rev. D59 (1999) 124022

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, REVTEX. Some misprints corrected and changes to improve presentation. Version to appear in PRD

Scientific paper

10.1103/PhysRevD.59.124022

We investigate higher than the first order gravitational perturbations in the Newman-Penrose formalism. Equations for the Weyl scalar $\psi_4,$ representing outgoing gravitational radiation, can be uncoupled into a single wave equation to any perturbative order. For second order perturbations about a Kerr black hole, we prove the existence of a first and second order gauge (coordinates) and tetrad invariant waveform, $\psi_I$, by explicit construction. This waveform is formed by the second order piece of $\psi_4$ plus a term, quadratic in first order perturbations, chosen to make $\psi_I$ totally invariant and to have the appropriate behavior in an asymptotically flat gauge. $\psi_I$ fulfills a single wave equation of the form ${\cal T}\psi_I=S,$ where ${\cal T}$ is the same wave operator as for first order perturbations and $S$ is a source term build up out of (known to this level) first order perturbations. We discuss the issues of imposition of initial data to this equation, computation of the energy and momentum radiated and wave extraction for direct comparison with full numerical approaches to solve Einstein equations.

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