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arXiv · 1504.00482

Higgs Inflation and General Initial Conditions

Sarang Zeynizadeh·Amin Rezaei Akbarieh
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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.

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Sarang Zeynizadeh, Amin Rezaei Akbarieh. 2015-04-02. Higgs Inflation and General Initial Conditions. https://doi.org/10.1140/epjc%2Fs10052-015-3525-3

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