Turbulence and Little Rip Cosmology
Turbulence and Little Rip Cosmology
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湍流和小裂隙宇宙学
DOI：
10.1103/physrevd.86.063007
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发表时间：
2012
影响因子：
5
通讯作者：
I. Brevik,
中科院分区：
文献类型：
--
作者：
Y.Aoki;T.Aoyama;M.Kurachi;T.Maskawa;K.Miura;K.-i.Nagai;H.Ohki,E.Rinaldi;A. Shibata;K.Yamawaki;T.Yamazaki,;I. Brevik,
在各种条件下，宇宙暗流体可能会发展出未来的大撕裂或小撕裂奇点。考虑了单组分和双组分模型。在后一种情况下，我们提出了一种方法，其中流体可以分解成两个组件，一个非湍流（理想）和一个湍流的一部分，服从两个不同的状态方程。对于非湍流部分，通常称为的湍流参数被假定为小于throughout。对于湍流部分，事实证明，它是足够的，位于精华区，以导致一个奇点。在单组分的情况下，我们研究了宇宙如何从一个具有恒定体积粘度的粘性时代发展到一个湍流时代，湍流实际上保护了宇宙不遇到奇点。同样的宇宙学在非均匀（不完美）流体方面的等效描述也被提出。
A variety of conditions are considered under which the cosmic dark fluid may be able to develop a future Big Rip or Little Rip singularity. Both one-component and two-component models are considered. In the latter case we present a way in which the fluid can be decomposed into two components, one nonturbulent (ideal) and one turbulent part, obeying two different equations of state. For the nonturbulent part, the thermodynamical parameter, commonly called, is assumed to be less thanthroughout. For the turbulent part, it turns out that it is sufficient thatlies in the quintessence region in order to lead to a singularity. Both Big Rip and Little Rip behavior for dark energy are found. In the one-component case, we examine how the universe may develop from a viscous era with constant bulk viscosity into a turbulent era, the turbulence in effect protecting the universe from encountering the singularity at all. The equivalent description of the same cosmology in terms of inhomogeneous (imperfect) fluid is also presented.