Interacting Chaplygin gas

Details Interacting Chaplygin gas Interacting Chaplygin gas

2005-09-30

arxiv.org/abs/astro-ph/0509895v2

Phys.Rev.D73:043518,2006

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, detailed discussions on the interaction term added

Scientific paper

10.1103/PhysRevD.73.043518

We investigate a kind of interacting Chaplygin gas model in which the Chaplygin gas plays the role of dark energy and interacts with cold dark matter particles. We find that there exists a stable scaling solution at late times with the Universe evolving into a phase of steady state. Furthermore, the effective equation of state of Chaplygin gas may cross the so-called phantom divide $w=-1$. The above results are derived from continuity equations, which means that they are independent of any gravity theories. Assuming standard general relativity and a spatially flat FRW metric, we also find the deceleration parameter is well consistent with current observations.

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