Observational Constraints on Undulant Cosmologies

Details Observational Constraints on Undulant Cosmologies Observational Constraints on Undulant Cosmologies

2005-10-06

arxiv.org/abs/astro-ph/0510178v2

JCAP 0604:008,2006

Astronomy and Astrophysics

Astrophysics

19 pages, 12 figures in 19 files, uses iopart.cls, iopart10.clo; added references

Scientific paper

10.1088/1475-7516/2006/04/008

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.

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