Gauge invariance and non-Gaussianity in Inflation
Cosmology and Nongalactic Astrophysics
2011-08-11 v2 General Relativity and Quantum Cosmology
High Energy Physics - Theory
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 hypersurfaces and the use of boundary terms in computations of non-Gaussianity.
Cite
@article{arxiv.1104.0292,
title = {Gauge invariance and non-Gaussianity in Inflation},
author = {Gerasimos Rigopoulos},
journal= {arXiv preprint arXiv:1104.0292},
year = {2011}
}
Comments
4 pages, no figures; v2: 5 pages, no figures, substantial text added, results unchanged, published in PRD Rapid Communications