2003/12/18 by Jerome Martin, Jérôme Martin, Patrick Peter · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevlett.92.061301
published as Phys.Rev.Lett. 92 (2004) 061301 · 4 pages, 1 figure, ReVTeX, to appear in Phys. Rev. Lett
arxiv created 2003/12/18 · openalex publication_date 2004/02/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.