Ultraviolet behaviour of Higgs inflation models

Autor: Ignatios Antoniadis, Anthony Guillen, Kyriakos Tamvakis
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Journal of High Energy Physics, Vol 2021, Iss 8, Pp 1-20 (2021)
Druh dokumentu: article
ISSN: 1029-8479
DOI: 10.1007/JHEP08(2021)018
Popis: Abstract We study the ultraviolet behaviour of Higgs inflation models above the apparent unitarity violation scale arising from the large non minimal coupling to gravity, by computing on-shell 4-point scattering amplitudes in the presence of a large inflaton background, away from the electroweak vacuum. We find that all tree-level amplitudes are well behaved at high energies below the inflaton background that can thus take values up to the Planck scale. This result holds in both the metric and Palatini formulation, and is independent of the frame (Jordan or Einstein) as expected. The same result also holds if an R 2 term is added to the action.
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