Moment transport equations for non-Gaussianity

Details Moment transport equations for non-Gaussianity Moment transport equations for non-Gaussianity

2009-09-11

arxiv.org/abs/0909.2256v3

JCAP 01 (2010) 024

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

24 pages, 4 colour figures; uses iopart.cls. v2: Erroneous statements about delta N method in Sec. 2 removed. Correction to ga

Scientific paper

10.1088/1475-7516/2010/01/024

We present a novel method for calculating the primordial non-Gaussianity produced by super-horizon evolution during inflation. Our method evolves the distribution of coarse-grained inflationary field values using a transport equation. We present simple evolution equations for the moments of this distribution, such as the variance and skewness. This method possesses some advantages over existing techniques. Among them, it cleanly separates multiple sources of primordial non-Gaussianity, and is computationally efficient when compared with popular alternatives, such as the "delta N" framework. We adduce numerical calculations demonstrating that our new method offers good agreement with those already in the literature. We focus on two fields and the fNL parameter, but we expect our method will generalize to multiple scalar fields and to moments of arbitrarily high order. We present our expressions in a field-space covariant form which we postulate to be valid for any number of fields.

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