Higgs G-inflation

TL;DR

This paper introduces a G-inflation model where the Higgs boson acts as the inflaton through Galileon-like interactions, producing primordial perturbations consistent with observations and establishing a new relation between tensor-to-scalar ratio and tensor spectral index.

Contribution

It proposes a novel Higgs G-inflation model with Galileon interactions and derives a unique consistency relation between inflationary parameters.

Findings

Primordial density perturbations match observational data.

A new consistency relation r = -32√6/9 n_T is established.

The model distinguishes itself from standard inflation models.

Abstract

A new class of inflation models within the context of G-inflation is proposed, in which the standard model Higgs boson can act as an inflaton thanks to Galileon-like non-linear derivative interaction. The generated primordial density perturbation is shown to be consistent with the present observational data. We also make a general discussion on potential-driven G-inflation models, and find a new consistency relation between the tensor-to-scalar ratio $r$ and the tensor spectral index $n_T$, $r = -32 \sqrt{6}n_T / 9$, which is crucial in discriminating the present models from standard inflation with a canonical kinetic term.