On the "Causality Argument" in Bouncing Cosmologies

Details On the "Causality Argument" in Bouncing Cosmologies On the "Causality Argument" in Bouncing Cosmologies

2003-12-18

arxiv.org/abs/astro-ph/0312488v1

Phys.Rev.Lett. 92 (2004) 061301

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, ReVTeX, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.061301

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 counter-example 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.

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