Phys. Rev. Lett. 92, 061301 (2004) [4 pages]On the “Causality Argument” in Bouncing CosmologiesReceived 8 July 2003; published 10 February 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.061301
DOI:
10.1103/PhysRevLett.92.061301
PACS:
98.80.Cq
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