On the causality argument in bouncing cosmologies
Dec, 2003Citations per year
Abstract: (arXiv)
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.- cosmological model
- causality
- effective potential
- perturbation
- transfer matrix
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