On unitarity in Higgs-like inflation. (arXiv:2305.05682v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Lebedev_O/0/1/0/all/0/1">Oleg Lebedev</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Mambrini_Y/0/1/0/all/0/1">Yann Mambrini</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Yoon_J/0/1/0/all/0/1">Jong-Hyun Yoon</a>
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.
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.
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