Gauge invariance and non-Gaussianity in Inflation
Abstract
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= const hypersurfaces and the use of boundary terms in computations of non-Gaussianity.
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