Slowroll freezing quintessence
Abstract
We examine the evolution of quintessence models with potentials satisfying (^{}/V)2≪1 and V^{}/V≪1, in the case where the initial field velocity is nonzero. We derive an analytic approximation for the evolution of the equation of state parameter, w, for the quintessence field. We show that such models are characterized by an initial rapid freezing phase, in which the equation of state parameter w decreases with time, followed by slow thawing evolution, for which w increases with time. These models resemble constantV models at early times but diverge at late times. Our analytic approximation gives results in excellent agreement with exact numerical evolution.
 Publication:

Physics Letters B
 Pub Date:
 October 2011
 DOI:
 10.1016/j.physletb.2011.09.034
 arXiv:
 arXiv:1106.0012
 Bibcode:
 2011PhLB..704..265D
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 6 pages, 5 figures, references added