Statistically-anisotropic tensor bispectrum from inflation

Statistically-anisotropic tensor bispectrum from inflation
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通货膨胀的统计各向异性张量双谱

DOI:
10.1088/1475-7516/2021/03/047
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发表时间:
2021
影响因子:
6.4
通讯作者:
Yokoyama Shuichiro
Yokoyama Shuichiro
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hiramatsu Takashi;Murai Kai;Obata Ippei;Yokoyama Shuichiro

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我们发展了在一种各向异性膨胀中产生张量非高斯性的可能性,其中(1)规范场与旁观标量场是动力学耦合的。由于这种耦合,出现了电场的相干模式,并软弱地打破了宇宙的各向同性。我们计算了规范场引起的线性极化张量微扰的双谱,发现它是强红倾斜的,并且具有明显的统计各向异性,包括高阶多极矩。有趣的是,具有特定线性极化模式组合的张量双谱占主导地位,其幅度取决于不同的多极矩集合。这种新的统计各向异性张量非高斯性可以用即将到来的宇宙微波背景B模偏振实验来检验。
We develop a possibility of generating tensor non-Gaussianity in a kind of anisotropic inflation, where a (1) gauge field is kinetically coupled to a spectator scalar field. Owing to this coupling, the coherent mode of the electric field appears and softly breaks the isotropy of the Universe. We compute the bispectrum of linearly-polarized tensor perturbations sourced by the gauge field and find that it is strongly red-tilted and has distinctive statistical anisotropies including higher-order multipole moments. Interestingly, the tensor bispectra with the specific combinations of linear polarization modes are dominant, and their amplitudes depend on the different sets of multipole moments. This new type of statistically-anisotropic tensor non-Gaussianity can be potentially testable with the upcoming cosmic microwave background B-mode polarization experiments.
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