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- W3100338003 abstract "Local-type primordial non-Gaussianity couples statistics of the curvature perturbation ζ on vastly different physical scales. Because of this coupling, statistics (i.e. the polyspectra) of ζ in our Hubble volume may not be representative of those in the larger universe — that is, they may be biased. The bias depends on the local background value of ζ, which includes contributions from all modes with wavelength k≲H0 and is therefore enhanced if the entire post-inflationary patch is large compared with our Hubble volume. We study the bias to locally-measured statistics for general local-type non-Gaussianity. We consider three examples in detail: (i) the usual fNL, gNL model, (ii) a strongly non-Gaussian model with ζ ∼ ζGp, and (iii) two-field non-Gaussian initial conditions. In each scenario one may generate statistics in a Hubble-size patch that are weakly Gaussian and consistent with observations despite the fact that the statistics in the larger, post-inflationary patch look very different." @default.
- W3100338003 created "2020-11-23" @default.
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- W3100338003 date "2013-06-19" @default.
- W3100338003 modified "2023-09-26" @default.
- W3100338003 title "Non-gaussian mode coupling and the statistical cosmological principle" @default.
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- W3100338003 doi "https://doi.org/10.1088/1475-7516/2013/06/024" @default.
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