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Statefinder Diagnostic for Variable Generalized Chaplygin Gas with the Sign-Changeable Interaction

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Abstract

In this paper, we apply the statefinder diagnostic to variable generalized Chaplygin gas (VGCG) with the sign-changeable interaction in which the interaction term Q can change its sign from Q<0 to Q>0 as the universe expands. The evolution trajectories of the statefinder pairs {r,s} and {r,q} are obtained under the circumstance where different values of model parameters are chosen. It is found that the coupling term does not affect the location of the late time attractor, but has an influence on the evolution of the statefinder parameters. Furthermore, it is shown that the evolution trajectories of our model in the r(s) diagram are different from those of other dark energy models.

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Authors and Affiliations

  1. School of Science, Huaihai Institute of Technology, Lianyungang, 222005, China

    Y. D. Xu

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  1. Y. D. Xu
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Correspondence to Y. D. Xu.

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Xu, Y.D. Statefinder Diagnostic for Variable Generalized Chaplygin Gas with the Sign-Changeable Interaction. Int J Theor Phys 52, 3269–3275 (2013). https://doi.org/10.1007/s10773-013-1623-2

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  • DOI: https://doi.org/10.1007/s10773-013-1623-2

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