Author:
Lebedev Oleg,Mambrini Yann,Yoon Jong-Hyun
Abstract
Abstract
We study inflationary models based on a non-minimal coupling of a singlet scalar to gravity,
focussing on the preheating dynamics and the unitarity issues in this regime. If the scalar does not have significant couplings to other fields,
particle production after inflation is far less efficient than that in Higgs inflation.
As a result, unitarity violation at large non-minimal couplings requires a different treatment. We find that collective effects in inflaton scattering processes during preheating
make an important impact on the unitarity constraint. Within effective field theory, the consequent upper bound on the non-minimal coupling is of order a few hundreds.
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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