Interacting dark energy: generic cosmological evolution for two scalar fields

Details Interacting dark energy: generic cosmological evolution for two scalar fields Interacting dark energy: generic cosmological evolution for two scalar fields

2007-03-27

arxiv.org/abs/astro-ph/0703702v1

JCAP0801:030,2008

Astronomy and Astrophysics

Astrophysics

13 pages, 16 figures

Scientific paper

10.1088/1475-7516/2008/01/030

We study the cosmological evolution of two coupled scalar fields with an arbitrary interaction term V_T(\phi,\vp) in the presence of a barotropic fluid, which can be matter or radiation. The force between the barotropic fluid and the scalar fields is only gravitational. We show that the dynamics is completely determine by only three parameters L_i i=1,2,3. We determine all critical points and study their stability. We find six different attractor solutions depending on the values of L_i and we calculate the relevant cosmological parameters. We discuss the possibility of having one of the scalar fields as of dark energy while the other could be a scalar field redshifting as matter.

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