k-Essence, superluminal propagation, causality and emergent geometry

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Published 28 February 2008 • Published under licence by IOP Publishing Ltd
, , Citation Eugeny Babichev et al JHEP02(2008)101 DOI 10.1088/1126-6708/2008/02/101

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Author affiliations

1 INFN — Laboratori Nazionali del Gran Sasso, S.S. 17bis, 67010, Assergi, L'Aquila, Italy

2 Institute for Nuclear Research of RAS, 60th October Anniversary Prospect 7a, 117312 Moscow, Russia

3 Arnold-Sommerfeld-Center for Theoretical Physics, Department für Physik, Ludwig-Maximilians-Universität München, Theresienstr. 37, D-80333, Munich, Germany

Dates

  1. Received 16 August 2007
  2. Accepted 8 February 2008
  3. Published

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1126-6708/2008/02/101

Abstract

The k-essence theories admit in general the superluminal propagation of the perturbations on classical backgrounds. We show that in spite of the superluminal propagation the causal paradoxes do not arise in these theories and in this respect they are not less safe than General Relativity.

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10.1088/1126-6708/2008/02/101