A new type of interaction between generalized Chaplygin gas and dark matter

Details A new type of interaction between generalized Chaplygin gas and dark matter A new type of interaction between generalized Chaplygin gas and dark matter

May 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ap%26ss.339...31x&link_type=abstract

Astrophysics and Space Science, Volume 339, Issue 1, pp.31-36

Astronomy and Astrophysics

Astrophysics

Interaction, Dark Energy, Generalized Chaplygin Gas, Attractor, Statefinder

Scientific paper

In this paper, we investigate the model with a new type of interaction between generalized Chaplygin gas (GCG) and dark matter. It is shown that there exists a stable scaling attractor, which provides the possibility to alleviate the coincidence problem. The equation of state (EoS) of GCG approaches the attractor phase from either w g >-1 or w g <-1 depending on the choice of its initial cosmic density parameter and the ratio of pressure to critical energy density. For initial choice of w g <-1, our new model allows the universe to cross the phantom divide (the transition from w g <-1 to w g >-1), and next cross again the phantom divide (the transition from w g >-1 to w g <-1), finally reach the attractor phase. We also find the new interacting term Q can change its sign from Q<0 to Q>0 as the universe expands, which is different from the usual interaction. Moreover, we investigate the model from statefinder viewpoint. The statefinder diagnostic can not only discriminate the model with different coupling constant but also distinguish the model from other dark energy models.

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