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Viscous Cardassian universe · Around

2009

Viscous Cardassian universe

Sun, Chang-Bo, Wang, Jia-Ling, Li, Xin-Zhou

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The viscous Cardassian cosmology is discussed, assuming that there is a bulk viscosity in the cosmic fluid.

The dynamical analysis indicates that there exists a singular curve in the phase diagram of viscous Cardassian model.
In the viscous PL model, the equation-of-state parameter $w_{k}$ is no longer a constant and it can cross the cosmological constant divide $w_{\Lambda}=-1$, in contrast with same problem of the ordinary PL model.
Other models possess with similar characteristics.

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