Squeezed tensor non-Gaussianity in non-attractor inflation

Squeezed tensor non-Gaussianity in non-attractor inflation
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非吸引子膨胀中的压缩张量非高斯性

DOI:
10.1088/1475-7516/2019/09/036
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发表时间:
2019
影响因子:
6.4
通讯作者:
Özsoy O
Özsoy O
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Özsoy O

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我们研究了单场膨胀中原始张量的非高斯性,在非吸引子演化阶段,当原始张量模式的光谱可以增强到在干涉仪尺度上可检测的水平时。利用[1]中引入的张量对偶性,我们解析地计算了非吸引子时代原始张量涨落的全双谱。在这一时期,张量双谱的形状在压缩极限中得到增强,其振幅可以相对于慢滚模型被放大,张量非高斯性可以表现出我们的设置特有的尺度依赖性。我们证明了我们的结果不依赖于用于计算的框架。压缩张量的非高斯性在原始张量扰动的随机背景的功率谱上引起了特征的四极各向异性。作为与引力波实验接触的一步,我们讨论了具有这种特征的地面迈克尔逊干涉仪对引力波背景的响应函数。
We investigate primordial tensor non-Gaussianity in single field inflation, during a phase of non-attractor evolution when the spectrum of primordial tensor modes can be enhanced to a level detectable at interferometer scales. Making use of a tensor duality we introduced in [1], we analytically compute the full bispectrum of primordial tensor fluctuations during the non-attractor era. During this epoch the shape of the tensor bispectrum is enhanced in the squeezed limit, its amplitude can be amplified with respect to slow-roll models, and tensor non-Gaussianity can exhibit a scale dependence distinctive of our set-up. We prove that our results do not depend on the frame used for the calculations. Squeezed tensor non-Gaussianity induces a characteristic quadrupolar anisotropy on the power spectrum of the stochastic background of primordial tensor perturbations. As a step to make contact with gravitational wave experiments, we discuss the response function of a ground based Michelson interferometer to a gravitational wave background with such a feature.
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