Observational Constraints on Undulant Cosmologies

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.

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

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Cited by in corpus (10)

• The Dynamics of Quintessence, The Quintessence of Dynamics
• Accelerated expansion from structure formation
• Structure formation in cosmologies with oscillating dark energy
• Reconstructing the History of Energy Condition Violation from Observational Data
• Dark Before Light: Testing the Cosmic Expansion History through the Cosmic Microwave Background
• Cosmological bounds on oscillating dark energy models
• Fitting oscillating string gas cosmology to supernova data
• Uniqueness of Current Cosmic Acceleration
• Constraining Temporal Oscillations of Cosmological Parameters Using Type Ia Supernovae
• The dark(er) side of inflation