Bounds on EFT’s in an expanding universe

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 fi...

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Bibliographic Details
Published in:Physical review. D 2024-04, Vol.109 (8), Article 085008
Main Author: Carrillo González, Mariana
Format: Article
Language:English
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Summary: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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.109.085008