Does anisotropic inflation produce a small statistical anisotropy?
Does anisotropic inflation produce a small statistical anisotropy?
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DOI：
10.1088/1475-7516/2018/01/049
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发表时间：
2017-11
影响因子：
6.4
通讯作者：
Tomohiro Fujita;Ippei Obata
中科院分区：
文献类型：
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作者：
Tomohiro Fujita;Ippei Obata
各向异性暴胀是一个有趣的具有\U（1）规范场的模型，它预言了由参数g* 表征的曲率扰动的统计各向异性。然而，我们发现，由于随机效应，背景规范场并不遵循经典吸引子解。我们开发的随机形式主义的向量场和解决朗之万和福克-普朗克方程。结果表明，该模型被CMB约束g*≤ 10−2排除，概率约为99.999%。
Anisotropic inflation is an interesting model with an \U(1) gauge field and it predicts the statistical anisotropy of the curvature perturbation characterized by a parameter g*. However, we find that the background gauge field does not follow the classical attractor solution due to the stochastic effect. We develop the stochastic formalism of a vector field and solve Langevin and Fokker-Planck equations. It is shown that this model is excluded by the CMB constraint g*≤ 10−2 with a high probability about 99.999%.