Two simple photon gauges in inflation
General Relativity and Quantum Cosmology
2025-06-30 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
Photon propagators for power-law inflation are constructed in two one-parameter families of noncovariant gauges, in an arbitrary number of spacetime dimensions. In both gauges photon propagators take relatively simple forms expressed in terms of scalar propagators and their derivatives. These are considerably simpler compared to their general covariant gauge counterpart. This makes feasible performing dimensionally regulated loop computations involving massless vector fields in inflation.
Cite
@article{arxiv.2503.12630,
title = {Two simple photon gauges in inflation},
author = {Dražen Glavan},
journal= {arXiv preprint arXiv:2503.12630},
year = {2025}
}
Comments
36 pages (including appendices); minor corrections; corresponds to published version