TY - JOUR
T1 - Statistical naturalness and non-gaussianity in a finite universe
AU - Nelson, Elliot
AU - Shandera, Sarah
PY - 2013/3/26
Y1 - 2013/3/26
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.110.131301
DO - 10.1103/PhysRevLett.110.131301
M3 - Article
AN - SCOPUS:84875725265
SN - 0031-9007
VL - 110
JO - Physical review letters
JF - Physical review letters
IS - 13
M1 - 131301
ER -