Gauge invariance and non-Gaussianity in Inflation

Details Gauge invariance and non-Gaussianity in Inflation Gauge invariance and non-Gaussianity in Inflation

2011-04-02

arxiv.org/abs/1104.0292v2

Phys.Rev.D84:021301,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, no figures; v2: 5 pages, no figures, substantial text added, results unchanged, published in PRD Rapid Communications

Scientific paper

10.1103/PhysRevD.84.021301

We clarify the role of gauge invariance for the computation of quantum non-Gaussian correlators in inflation. A gauge invariant generating functional for n-point functions is given and the special status of the spatially flat gauge is pointed out. We also comment on the relation between gauge transformations, field redefinitions, the choice of $t={\rm const}$ hypersurfaces and the use of boundary terms in computations of non-Gaussianity.

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