Bounds on EFT's in an expanding Universe
High Energy Physics - Theory
2024-04-02 v2 Cosmology and Nongalactic Astrophysics
Abstract
We find bounds on the Wilson coefficients of effective field theories (EFTs) living in a Universe undergoing expansion by requiring that its modes do not propagate further than a minimally coupled photon by a resolvable amount. To do so, we compute the spatial shift suffered by the EFT modes at a fixed time slice within the WKB approximation and the regime of validity of the EFT. We analyze the bounds arising on shift-symmetric scalars and curved space generalizations of Galileons.
Cite
@article{arxiv.2312.07651,
title = {Bounds on EFT's in an expanding Universe},
author = {Mariana Carrillo González},
journal= {arXiv preprint arXiv:2312.07651},
year = {2024}
}
Comments
double-column, 7 pages plus appendices and references, 2 figures; v2 matches the published version