A new type of interaction between generalized Chaplygin gas and dark matter |
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| Authors: | Y D Xu Z G Huang X H Zhai |
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| Institution: | (1) School of Science, Huaihai Institute of Technology, 222005 Lianyungang, China;(2) Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, Shanghai, China |
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| Abstract: | 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 w g w g w g >?1), and next cross again the phantom divide (the transition from w g >?1 to w g 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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