Evolution of Oscillating Scalar Fields as Dark Energy

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dc.creatorDutta, Sourish
dc.creatorScherrer, Robert J.
dc.date2008-05-06
dc.date2008-10-03
dc.date.accessioned2026-07-07T11:50:36Z
dc.date.available2026-07-07T11:50:36Z
dc.descriptionOscillating scalar fields, with an oscillation frequency much greater than the expansion rate, have been proposed as models for dark energy. We examine these models, with particular emphasis on the evolution of the ratio of the oscillation frequency to the expansion rate. We show that this ratio always increases with time if the dark energy density declines less rapidly than the background energy density. This allows us to classify oscillating dark energy models in terms of the epoch at which the oscillation frequency exceeds the expansion rate, which is effectively the time at which rapid oscillations begin. There are three basic types of behavior: early oscillation models, in which oscillations begin during the matter-dominated era, late oscillation models, in which oscillations begin after scalar-field domination, and non-oscillating models. We examine a representative set of models (those with power-law potentials) and determine the parameter range giving acceptable agreement with the supernova observations. We show that a subset of all three classes of models can be consistent with the observational data.
dc.description6 pages, 7 figures, references and brief discussion added, matches version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0805.0763
dc.identifierhttp://arxiv.org/abs/0805.0763
dc.identifierPhys.Rev.D78:083512,2008
dc.identifierdoi:10.1103/PhysRevD.78.083512
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203608
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleEvolution of Oscillating Scalar Fields as Dark Energy
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