New Higgs Inflation in a No-Scale Supersymmetric SU(5) GUT

TL;DR

This paper develops a new class of supersymmetric Higgs inflation models within no-scale supergravity and SU(5) GUT, capable of producing observable tensor-to-scalar ratios and consistent spectral indices.

Contribution

It introduces a novel extension of no-scale Kahler potential and SU(5) superpotential to generate versatile Higgs inflation potentials.

Findings

Models can produce tensor-to-scalar ratio r from 10^{-3} to 10^{-1}

Scalar spectral index n_s approximately 0.96

Includes quadratic and Starobinsky-type potentials as limits

Abstract

Higgs inflation is attractive because it identifies the inflaton with the electroweak Higgs boson. In this work, we construct a new class of supersymmetric Higgs inflationary models in the no-scale supergravity with an SU(5) GUT group. Extending the no-scale Kahler potential and SU(5) GUT superpotential, we derive a generic potential for Higgs inflation that includes the quadratic monomial potential and a Starobinsky-type potential as special limits. This type of models can accommodate a wide range of the tensor-to-scalar ratio $r = O(10^{-3}-10^{-1})$, as well as a scalar spectral index $n_s \sim 0.96$.