Numerical validation of the Kerr metric in Bondi-Sachs form

Details Numerical validation of the Kerr metric in Bondi-Sachs form Numerical validation of the Kerr metric in Bondi-Sachs form

2005-06-13

arxiv.org/abs/gr-qc/0506077v1

Phys.Rev.D73:084023,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages

Scientific paper

10.1103/PhysRevD.73.084023

A metric representing the Kerr geometry has been obtained by Pretorius and Israel. We make a coordinate transformation on this metric, thereby bringing it into Bondi-Sachs form. In order to validate the metric, we evaluate it numerically on a regular grid of the new coordinates. The Ricci tensor is then computed, for different discretizations, and found to be convergent to zero. We also investigate the behaviour of the metric near the axis of symmetry and confirm regularity. Finally we investigate a Bondi-Sachs representation of the Kerr geometry reported by Fletcher and Lun; we confirm numerically that their metric is Ricci flat, but find that it has an irregular behaviour at the pole.

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