English

Statistical Naturalness and non-Gaussianity in a Finite Universe

Cosmology and Nongalactic Astrophysics 2013-07-25 v2

Abstract

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.

Keywords

Cite

@article{arxiv.1212.4550,
  title  = {Statistical Naturalness and non-Gaussianity in a Finite Universe},
  author = {Elliot Nelson and Sarah Shandera},
  journal= {arXiv preprint arXiv:1212.4550},
  year   = {2013}
}

Comments

5 pages; minor changes and clarifications, matches published version