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2012

Statistical Naturalness and non-Gaussianity in a Finite Universe

Nelson, Elliot, Shandera, Sarah

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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.

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J. Bramante, J. Kumar, E. Nelson, S. Shandera, [arXiv:1307.5083 [astro-ph.CO]]

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S. Nurmi, C. Byrnes and G. Tasinato, [arXiv:1301.3128 [astro-ph.CO]]

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