Higgs-Palatini Inflation and Unitarity

Details Higgs-Palatini Inflation and Unitarity Higgs-Palatini Inflation and Unitarity

2010-12-13

arxiv.org/abs/1012.2900v2

Physics Letters B 698 (2011) 425-429

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, discussion enhanced, references added, accepted by PLB

Scientific paper

10.1016/j.physletb.2011.03.042

In the Higgs inflation scenario the Higgs field is strongly coupled to the Ricci scalar in order to drive primordial inflation. However, in its original form in pure metric formulation of gravity, the ultraviolet (UV) cutoff of the Higgs interactions and the Hubble rate are of the same magnitude, and this makes the whole inflationary evolution dependent of the unknown UV completion of the Higgs sector. This problem, the unitarity violation, plagues the Higgs inflation scenario. In this letter we show that, in the Palatini formulation of gravitation, Higgs inflation does not suffer from unitarity violation since the UV cutoff lies parametrically much higher than the Hubble rate so that unknown UV physics does not disrupt the inflationary dynamics. Higgs-Palatini inflation, as we call it, is, therefore, UV-safe, minimal and endowed with predictive power.

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