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Observational Constraints on Undulant Cosmologies | | Gabriela Barenboim
; Olga Mena Requejo
; Chris Quigg
; | | Date: |
6 Oct 2005 | | Abstract: | In an undulant universe, cosmic expansion is characterized by alternating periods of acceleration and deceleration. We examine cosmologies in which the dark-energy equation of state varies periodically with the number of e-foldings of the scale factor of the universe, and use observations to constrain the frequency of oscillation. We find a tension between a forceful response to the cosmic coincidence problem and the standard treatment of structure formation. | | Source: | arXiv, astro-ph/0510178 | | Services: | Forum | Review | PDF | Favorites | |
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