Friedmann Cosmology with a Generalized Equation of State and Bulk Viscosity |
| |
Authors: | MENG Xin-He REN Jie HU Ming-Guang |
| |
Affiliation: | Department of Physics, Nankai University, Tianjin 300071, China |
| |
Abstract: | The universe content is considered as a non-perfect fluid with bulk viscosity and is described by a more general equation of state (endowed some deviation from the conventionally assumed cosmic perfect fluid model). We assume the bulk viscosity is a linearcombination of two terms: one is constant, and the other isproportional to the scalar expansion θ=3dot{a}/a. Theequation of state is described as p=(γ-1)ρ+p0, wherep0 is a parameter. In this framework we demonstrate that thismodel can be used to explain the dark energy dominated universe,and different proper choices of the parameters may lead to threekinds of fates of the cosmological evolution: no futuresingularity, big rip, or Type-III singularity as presented in[S. Nojiri, S.D. Odintsov, and S. Tsujikawa, Phys. Rev. D71 (2005) 063004]. |
| |
Keywords: | Friedmann cosmology equation of state bulk viscosity dark energy |
本文献已被 万方数据 等数据库收录! |
| 点击此处可从《理论物理通讯》浏览原始摘要信息 |
|
点击此处可从《理论物理通讯》下载全文 |
|