On the “Causality Argument” in Bouncing Cosmologies

Jérôme Martin and Patrick Peter
Phys. Rev. Lett. 92, 061301 – Published 10 February 2004

Abstract

We exhibit a situation in which cosmological perturbations of astrophysical relevance propagating through a bounce are affected in a scale-dependent way. Involving only the evolution of a scalar field in a closed universe described by general relativity, the model is consistent with causality. Such a specific counterexample leads to the conclusion that imposing causality is not sufficient to determine the spectrum of perturbations after a bounce provided it is known before. We discuss consequences of this result for string motivated scenarios.

  • Figure
  • Received 8 July 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.061301

©2004 American Physical Society

Authors & Affiliations

Jérôme Martin* and Patrick Peter

  • Institut d’Astrophysique de Paris, GReCO, FRE 2435-CNRS, 98bis Boulevard Arago, 75014 Paris, France

  • *Electronic address: jmartin@iap.fr
  • Electronic address: peter@iap.fr

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Issue

Vol. 92, Iss. 6 — 13 February 2004

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