Observational Constraints on Undulant Cosmologies
Astrophysics
2009-11-11 v2 High Energy Physics - Phenomenology
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.
Cite
@article{arxiv.astro-ph/0510178,
title = {Observational Constraints on Undulant Cosmologies},
author = {Gabriela Barenboim and Olga Mena Requejo and Chris Quigg},
journal= {arXiv preprint arXiv:astro-ph/0510178},
year = {2009}
}
Comments
19 pages, 12 figures in 19 files, uses iopart.cls, iopart10.clo; added references