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arXiv · 1806.09129

Lowering the self-coupling of the scalar field in a generalized Higgs inflation

Kourosh Nozari·S. Shafizadeh·N. Rashidi
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Abstract

We study cosmological dynamics of a generalized Higgs inflation. By expanding the action up to the second and third order in the small perturbations, we study the primordial perturbation and its non-Gaussian distribution. We study the non-Gaussian feature in both the equilateral and orthogonal configurations. By adopting a quartic potential, we perform a numerical analysis on the model's parameter space and compare the results with Planck2015 observational data. To obtain some observational constraint, we focus on the self-coupling and the non-minimal coupling parameters. We show that, in the presence of the non-minimal coupling and the Galileon-like interaction, the self-coupling parameter can be reduced to the order of $10^{-6}$ which is much larger than the value that CMB normalization suggests for this self-coupling.

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Kourosh Nozari, S. Shafizadeh, N. Rashidi. 2018-06-24. Lowering the self-coupling of the scalar field in a generalized Higgs inflation. https://doi.org/10.1007/s10509-018-3358-2

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