Squeezed limit of the solid inflation three-point function
Squeezed limit of the solid inflation three-point function
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固体膨胀三点函数的压缩极限
DOI：
10.1103/physrevd.90.063506
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发表时间：
2013
影响因子：
5
通讯作者：
Junpu Wang
中科院分区：
文献类型：
--
作者：
S. Endlich;B. Horn;Alberto Nicolis;Junpu Wang
最近提出的“固体膨胀”模型具有一个奇特的标量扰动三点函数，具有各向异性、纯四极、压缩极限。我们通过极其简单的计算确认了这个结果以及三点函数的总体幅度，其中我们从一开始就关注压缩极限，并遵循推导一致性关系时采用的标准逻辑。我们的系统违反了一致性关系，但在压缩限制下，三点函数仍然可以交换为依赖于背景的两点函数，后者可以立即计算。此外，我们使用这些简单的方法得出了一些新的结果——即涉及向量和张量扰动的三点相关器的某些压缩极限。
The recently proposed model of 'solid inflation' features a peculiar three-point function for scalar perturbations with an anisotropic, purely quadrupolar, squeezed limit. We confirm this result as well as the overall amplitude of the three point-function via an extremely simple computation, where we focus on the squeezed limit from the start and follow the standard logic adopted in deriving the consistency relations. Our system violates the consistency relations, but in the squeezed limit the three-point function can still be traded for a background-dependent two-point function, which is immediate to compute. Additionally, we use these simple methods to derive some new results - namely, certain squeezed limits of the three-point correlators involving vector and tensor perturbations as well.