Multifield dynamics of supersymmetric Higgs inflation in SU(5) GUT

TL;DR

This paper investigates supersymmetric Higgs inflation within SU(5) GUT, demonstrating that with suitable parameters, the model aligns well with cosmological data and remains robust despite multifield effects.

Contribution

It introduces a supersymmetric SU(5) GUT Higgs inflation model with a specific Kahler potential, showing its predictions are consistent with observations and insensitive to multifield complexities.

Findings

Model agrees with current cosmological observations.

Multifield effects are minor, ensuring robust predictions.

Proper Kahler potential choice is crucial for model viability.

Abstract

We study the Higgs inflation model realized in the supersymmetric SU(5) grand unified theory (GUT), focusing on its multifield dynamics and prediction of cosmological observables. The requirement for GUT symmetry breaking during inflation imposes tight constraints on the model parameters. We find, nevertheless, with an appropriately chosen noncanonical Kahler potential the model is in excellent agreement with the present cosmological observation. The effects from multifield dynamics is found to be minor and thus, unlike other similar supersymmetric implementation of nonminimally coupled Higgs inflation, the prediction of this model is robust against multifield ambiguities.