Friedmann Cosmology with a Generalized Equation of State and Bulk Viscosity
Meng Xin-HeDepartment of Physics, Nankai University, Tianjin 300071, ChinaRen JieDepartment of Physics, Nankai University, Tianjin 300071, ChinaHu Ming-GuangDepartment of Physics, Nankai University, Tianjin 300071, China
2007en
ABI
Abstract
The universe media is considered as a non-perfect fluid with bulk viscosity and described by a more general equation of state. We assume the bulk viscosity is a linear combination of the two terms: one is constant, and the other is proportional to the scalar expansion $\theta=3\dot{a}/a$. The equation of state is described as $p=(\gamma-1)\rho+p_0$, where $p_0$ is a parameter. This model can be used to explain the dark energy dominated universe. Different choices of the parameters may lead to three kinds of fates of the cosmological evolution: no future singularity, big rip, or Type III singularity of Ref. [S. Nojiri, S.D. Odintsov, and S. Tsujikawa, Phys. Rev. D \textbf{71}, 063004 (2005)].
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