The speed of gravity in general relativity

Details The speed of gravity in general relativity The speed of gravity in general relativity

2010-09-09

arxiv.org/abs/1009.1761v2

Grav.Cosmol.17:194-197,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

typos corrected, etc

Scientific paper

10.1134/S0202289311020150

The question is discussed of what is the speed of gravity (at the fundamental non-perturbative level). The question is important, if nowhere else, in discussing the problem of information "lost" in black holes. It turns out that the duly defined "gravitational signal" generally may be causal, superluminal and "semi-superluminal". In the class of globally hyperbolic spacetimes the two last varieties coincide. And if some (often imposed, but not always satisfied) conditions hold, the signals may be \emph{only} causal. In this sense the speed of gravity does not exceed the speed of light.

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