Statistical naturalness and non-gaussianity in a finite universe.
Statistical naturalness and non-gaussianity in a finite universe.
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有限宇宙中的统计自然性和非高斯性。
DOI：
10.1103/physrevlett.110.131301
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发表时间：
2012
影响因子：
8.6
通讯作者：
S. Shandera
中科院分区：
文献类型：
--
作者：
Elliot Nelson;S. Shandera
假设观测到的宇宙只是具有统计齐次和各向同性扰动的更大空间的子集，我们研究了原始曲率扰动的n点函数的行为。如果较大的空间在局部类型非高斯统计量的族中具有任意的n点函数，则充分偏向的较小体积将具有来自该族的具有弱非高斯和有序矩的“自然”版本的统计，而不考虑原始场的统计。我们还描述了这种偏置对双谱形状的影响。
We study the behavior of n-point functions of the primordial curvature perturbations, assuming our observed Universe is only a subset of a larger space with statistically homogeneous and isotropic perturbations. If the larger space has arbitrary n-point functions in a family of local type non-gaussian statistics, sufficiently biased smaller volumes will have statistics from a "natural" version of that family with moments that are weakly non-gaussian and ordered, regardless of the statistics of the original field. We also describe the effect of this bias on the shape of the bispectrum.