Any spacetime has a Bianchi type I spacetime as a limit

Details Any spacetime has a Bianchi type I spacetime as a limit Any spacetime has a Bianchi type I spacetime as a limit

2010-08-27

arxiv.org/abs/1008.4639v1

Class.Quant.Grav.28:055007,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages; no figures

Scientific paper

10.1088/0264-9381/28/5/055007

Pick an arbitrary timelike geodesic in an arbitrary spacetime. We demonstrate that there is a particular limiting process, an "ultra-local limit", in which the immediate neighborhood of the timelike geodesic can be "blown up" to yield a general (typically non-diagonal) Bianchi type I spacetime. This process shares some (but definitely not all) of the features of the Penrose limit, whereby the immediate neighborhood of an arbitrary null geodesic is "blown up" to yield a pp-wave as a limit.

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