粘性收缩宇宙的无毛定理
Cosmic no-hair theorems for viscous contracting Universes
摘要：
一个宇宙无毛定理的所有初始收缩，空间均匀，正交Bianchi宇宙推导-这表明，所有这样的宇宙渐近到一个空间平坦的，各向同性的宇宙，包括剪切粘性应力。这在收缩的宇宙中建立了一种新的各向同性机制，它不依赖于使用有效的超刚性状态流体方程的类似于ekpyrosis-like机制，也就是说，其中压力远大于能量密度。
英文摘要：
A cosmic no-hair theorem for all initially contracting, spatially homogeneous, orthogonal Bianchi Cosmologies is derived - which shows that all such Universes asymptote to a spatially flat, isotropic Universe with the inclusion of a shear viscous stress. This establishes a new mechanism of isotropisation in a contracting Universe, which does not take recourse to an ekpyrosis-like mechanism using an effective ultra-stiff equation of state fluid, that is, one in which the pressure is much greater than the energy density.
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