Statistically Anisotropic Tensor Modes from Inflation

Statistically Anisotropic Tensor Modes from Inflation
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通货膨胀的统计各向异性张量模式

DOI：
10.1088/1475-7516/2018/07/023
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发表时间：
2018
期刊：
JCAP
影响因子：
--
通讯作者：
Shuichiro
Shuichiro
中科院分区：
--
文献类型：
--
作者：
Fujita;Tomohiro and Obata;Ippei and Tanaka;Takahiro and Yokoyama;Shuichiro

文献摘要

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我们考虑了旁观标量场与U（1）规范场耦合的暴胀宇宙，计算了曲率微扰和引力波。我们发现，来源的GWs可以大于真空涨落的GWs，它们是统计各向异性的，以及线偏振。无论模型参数如何，GW功率谱都获得关于波数k和背景矢量场之间的角度θ的更高多极矩，如脚本P h（1− cos 2θ+ cos 4θ− cos 6θ）。
We consider the inflationary universe with a spectator scalar field coupled to a U (1) gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments with respect to the angle θ between a wave number k and a background vector field as Script P h∝(1− cos 2θ+ cos 4θ− cos 6θ) irrespective of the model parameters.