Low energy implications of cosmological data in $U(1)_X$ Higgs inflation

TL;DR

This paper explores how cosmological data constrains a $U(1)_X$ Higgs inflation model, analyzing its compatibility with collider experiments, reheating, and dark matter, highlighting the model's testability with future LHC data.

Contribution

It investigates the parameter space of a $U(1)_X$ Higgs inflation model constrained by cosmological data and collider experiments, providing insights into its viability and future testability.

Findings

Cosmological data severely constrains the effective potential coefficients.

Model parameters are compatible with current LHC Run-2 data.

Future High-Luminosity LHC experiments can further restrict the model.

Abstract

A scalar field having the Coleman-Weinberg type effective potential arises in various contexts of particle physics and serves as a useful framework for discussing cosmic inflation. According to recent studies based on the Markov chain Monte Carlo analysis, the coefficients of such an effective potential are severely constrained by the cosmological data. We investigate the impact of this observation on the physics beyond the Standard Model, focusing on an inflationary model based on the $U(1)_X$-extended Standard Model as a well-motivated example. We examine the parameter region that is not excluded by the Large Hadron Collider (LHC) Run-2 at 139 fb${}^{-1}$ integrated luminosity, and show that the model parameters can be further constrained by the High-Luminosity LHC experiments in the near future. We also comment on the possible reheating mechanism and the dark matter candidates of this scenario.