Inflationary universe with anisotropic hair.
Inflationary universe with anisotropic hair.
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DOI：
10.1103/physrevlett.102.191302
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发表时间：
2009-02
影响因子：
8.6
通讯作者：
Masa-aki Watanabe;S. Kanno;J. Soda
中科院分区：
文献类型：
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作者：
Masa-aki Watanabe;S. Kanno;J. Soda
我们研究了一个矢量场和一个膨胀子场耦合的膨胀场景，证明了膨胀宇宙对于大范围的耦合函数具有各向异性。这种各向异性膨胀是一种跟踪解，其中矢量场的能量密度跟随膨胀子场的能量密度，而与初始条件无关。我们发现了各向异性与慢滚膨胀参数之间的普遍关系。我们的发现具有观测意义，并给出了宇宙无毛猜想的反例。
We study an inflationary scenario with a vector field coupled with an inflaton field and show that the inflationary Universe is endowed with anisotropy for a wide range of coupling functions. This anisotropic inflation is a tracking solution where the energy density of the vector field follows that of the inflaton field irrespective of initial conditions. We find a universal relation between the anisotropy and a slow-roll parameter of inflation. Our finding has observational implications and gives a counterexample to the cosmic no-hair conjecture.