On the "Causality argument" in bouncing cosmologies |
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Authors: | Martin Jérôme Peter Patrick |
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Institution: | Institut d'Astrophysique de Paris, GReCO, FRE 2435-CNRS, 98bis Boulevard Arago, 75014 Paris, France. jmartin@iap.fr |
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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. |
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