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Astrophysics

arXiv:0706.1538 (astro-ph)
[Submitted on 11 Jun 2007 (v1), last revised 28 Jun 2007 (this version, v2)]

Title:Superluminal motion and closed signal curves

Authors:Camille Bonvin, Chiara Caprini, Ruth Durrer
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Abstract: We discuss some properties of Lorentz invariant theories which allow for superluminal motion. We show that, if signals are always sent forward in time, closed curves along which signals propagate can be formed. This leads to problems with causality and with the second law of thermodynamics. Only if one singles out one frame with respect to which all signals travel forward in time, the formation of 'closed signal curves' can be prevented. However, the price to pay is that in some reference frames perturbations propagate towards the past or towards the future, depending on the direction of emission.
Comments: 10 pages, 3 figures, argument about the Hawking and Ellis theorem on stable causality added in the conclusion
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:0706.1538 [astro-ph]
  (or arXiv:0706.1538v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1538

Submission history

From: Chiara Caprini [view email]
[v1] Mon, 11 Jun 2007 18:27:43 UTC (37 KB)
[v2] Thu, 28 Jun 2007 19:43:47 UTC (38 KB)
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