On Cosmic No-hair in Bimetric Gravity and the Higuchi Bound.
On Cosmic No-hair in Bimetric Gravity and the Higuchi Bound.
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关于双重力和樋口束缚中的宇宙无毛。
DOI：
10.1093/ptep/ptt004
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发表时间：
2013
影响因子：
3.5
通讯作者：
Tomohiro Takahashi
中科院分区：
文献类型：
--
作者：
Yuki Sakakihara;Jiro Soda;Tomohiro Takahashi
我们研究存在自旋 2 物质（即双计量重力）的情况下的宇宙无毛现象。我们通过物理领域的宇宙学常数获得了稳定的德西特解，并找到了宇宙无毛论正确的证据。在存在另一个宇宙学常数的情况下，德西特解有两个分支。在均匀各向异性扰动下，其中之一始终稳定，在线性水平上不违反宇宙无毛定律。另一个分支的稳定性取决于参数，宇宙无毛一般可以被违反。值得注意的是，两个分支的分叉点与樋口界完全重合。事实证明，存在一个德西特解，其中宇宙无毛保持在线性水平，并且各向异性扰动的有效质量高于樋口界。
We study the cosmic no-hair in the presence of spin-2 matter, i.e. in bimetric gravity. We obtain stable de Sitter solutions with the cosmological constant in the physical sector and find evidence that the cosmic no-hair is correct. In the presence of the other cosmological constant, there are two branches of de Sitter solutions. Under homogeneous anisotropic perturbations, one of them is always stable and there is no violation of the cosmic no-hair at the linear level. The stability of the other branch depends on parameters and the cosmic no-hair can be violated in general. Remarkably, the bifurcation point of two branches exactly coincides with the Higuchi bound. It turns out that there exists a de Sitter solution for which the cosmic no-hair holds at the linear level and the effective mass for the anisotropic perturbations is above the Higuchi bound.