Observational Constraints on Undulant Cosmologies

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RESEARCH PRODUCT

Observational Constraints on Undulant Cosmologies

Chris Quigg Gabriela Barenboim Olga Mena Requejo

subject

Physics COSMIC cancer database Structure formation Oscillation Equation of state (cosmology)media_common.quotation_subject Astrophysics (astro-ph)FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Universe Metric expansion of space Acceleration High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph)Scale factor (cosmology)media_common

description

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.

year	journal	country	edition	language
2005-10-06

https://dx.doi.org/10.48550/arxiv.astro-ph/0510178

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