Two-Field Quintom Models in the w-w' Plane
Astrophysics
2008-11-26 v2
Abstract
The w-w' plane, defined by the equation of state parameter for the dark energy and its derivative with respect to the logarithm of the scale factor, is useful to the study of classifying the dynamical dark energy models. In this note, we examine the evolving behavior of the two-field quintom models with w crossing the w=-1 barrier in the w-w' plane. We find that these models can be divided into two categories, type A quintom in which w changes from >-1 to <-1 and type B quintom in which w changes from <-1 to >-1 as the universe expands.
Cite
@article{arxiv.astro-ph/0608165,
title = {Two-Field Quintom Models in the w-w' Plane},
author = {Zong-Kuan Guo and Yun-Song Piao and Xinmin Zhang and Yuan-Zhong Zhang},
journal= {arXiv preprint arXiv:astro-ph/0608165},
year = {2008}
}
Comments
5 pages, 2 figures, RevTeX, Accepted for publication as a Brief Report in Physical Review D