Faster-than-c signals, special relativity, and causality

Details Faster-than-c signals, special relativity, and causality Faster-than-c signals, special relativity, and causality

2001-07-27

arxiv.org/abs/gr-qc/0107091v2

Annals Phys. 298 (2002) 167-185

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Plain LaTeX2E; 25 pages; 4 embedded figures (LaTeX pictures). V2: Some discussion clarified, minor rearrangements, references

Scientific paper

10.1006/aphy.2002.6233

Motivated by the recent attention on superluminal phenomena, we investigate the compatibility between faster-than-c propagation and the fundamental principles of relativity and causality. We first argue that special relativity can easily accommodate -- indeed, does not exclude -- faster-than-c signalling at the kinematical level. As far as causality is concerned, it is impossible to make statements of general validity, without specifying at least some features of the tachyonic propagation. We thus focus on the Scharnhorst effect (faster-than-c photon propagation in the Casimir vacuum), which is perhaps the most plausible candidate for a physically sound realization of these phenomena. We demonstrate that in this case the faster-than-c aspects are ``benign'' and constrained in such a manner as to not automatically lead to causality violations.

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