Scalar fields near compact objects: Resummation versus UV completion
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Peer-reviewed
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Abstract
Low-energy effective field theories containing a light scalar field are used
extensively in cosmology, but often there is a tension between embedding such
theories in a healthy UV completion and achieving a phenomenologically viable
screening mechanism in the IR. Here, we identify the range of interaction
couplings which allow for a smooth resummation of classical non-linearities
(necessary for kinetic/Vainshtein-type screening), and compare this with the
range allowed by unitarity, causality and locality in the underlying UV theory.
The latter region is identified using positivity bounds on the
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1475-7516