Two-Field Quintom Models in the w-w' Plane

Details Two-Field Quintom Models in the w-w' Plane Two-Field Quintom Models in the w-w' Plane

2006-08-08

arxiv.org/abs/astro-ph/0608165v2

Phys.Rev.D74:127304,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, RevTeX, Accepted for publication as a Brief Report in Physical Review D

Scientific paper

10.1103/PhysRevD.74.127304

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.

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