Causality and the speed of sound

Details Causality and the speed of sound Causality and the speed of sound

2007-03-25

arxiv.org/abs/gr-qc/0703121v2

Gen.Rel.Grav.39:1651-1660,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

v2: additional discussion on models that appear to have superluminal signal speeds; version to appear in GRG

Scientific paper

10.1007/s10714-007-0479-2

A usual causal requirement on a viable theory of matter is that the speed of
sound be at most the speed of light. In view of various recent papers querying
this limit, the question is revisited here. We point to various issues
confronting theories that violate the usual constraint.

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