Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-06
Phys.Rev.D78:083512,2008
Astronomy and Astrophysics
Astrophysics
6 pages, 7 figures, references and brief discussion added, matches version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.78.083512
Oscillating 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.
Dutta Sourish
Scherrer Robert J.
No associations
LandOfFree
Evolution of Oscillating Scalar Fields as Dark Energy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolution of Oscillating Scalar Fields as Dark Energy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of Oscillating Scalar Fields as Dark Energy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-209482