Higgs Inflation and General Initial Conditions

Abstract

Higgs field of particle physics can play the role of the inflaton in the early universe, if it is non-minimally coupled to gravity. The Higgs inflation scenario predicts a small tensor to scalar ratio: $r\simeq 0.003$. Although this value is consistent with the upper bound $r<0.12$ given by BICEP2/Keck Array and Planck data, but it is not at their maximum likelihood point: $r\simeq 0.05$. Inflationary observables depend not only on the inflationary models, but also depend on the initial conditions of inflation. Changing initial state of inflation can improve the value of $r$. In this work, we study the Higgs inflation model under general initial conditions and show that there is a subset of these general initial conditions which leads to enhancement of $r$. Then we show that this region of parameter space is consistent with non-Gaussianity bound.

13 pages, 2 figures

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Cited by in corpus (5)

• Primordial tensor non-Gaussianities from general single-field inflation with non-Bunch-Davies initial states
• Ultraviolet behaviour of Higgs inflation models
• Mimetic gravity: mimicking the dynamics of the primeval universe in the context of loop quantum cosmology
• On Higgs inflation in non-minimally coupled models of gravity
• Stochastic gravitational wave background anisotropies from inflation with non-Bunch-Davies states