Friedmann Cosmology with a Generalized Equation of State and Bulk Viscosity
Friedmann Cosmology with a Generalized Equation of State and Bulk Viscosity
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DOI：
10.1088/0253-6102/47/2/036
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发表时间：
2005-09
影响因子：
3.1
通讯作者：
Xin-He Meng;Jie Ren;Ming-Guang Hu
中科院分区：
文献类型：
--
作者：
Xin-He Meng;Jie Ren;Ming-Guang Hu
宇宙内容物被认为是一种非理想流体的体积粘度和描述的状态方程（赋予一些偏离传统假设的宇宙完美流体模型）。我们假设体积粘度是两项的线性组合：一项是常数，另一项与标量展开式θ = 3 π/a成比例。状态方程描述为p =（γ−1）ρ+p0，其中p0是一个参数。在这个框架下，我们证明了该模型可以用来解释暗能量主导的宇宙，并且不同的参数选择可能导致宇宙演化的三种命运：无未来奇点、大撕裂和III型奇点[S. Nojiri，S.D.奥金佐夫和S. Tsujikawa，Phys.Rev.D71（2005）063004]。
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 linear combination of two terms: one is constant, and the other is proportional to the scalar expansion θ = 3ȧ/a. The equation of state is described as p = (γ−1)ρ+p0, where p0 is a parameter. In this framework we demonstrate that this model can be used to explain the dark energy dominated universe, and different proper choices of the parameters may lead to three kinds of fates of the cosmological evolution: no future singularity, big rip, or Type-III singularity as presented in [S. Nojiri, S.D. Odintsov, and S. Tsujikawa, Phys. Rev. D 71 (2005) 063004].