Two-Field Quintessential Higgs model and the Swampland

TL;DR

This paper investigates a two-field model coupling quintessence and the Higgs field, testing its consistency with the Swampland conjecture by analyzing inflationary observables and finding constraints that challenge the conjecture.

Contribution

It provides a detailed analysis of a coupled quintessence-Higgs model and assesses its compatibility with the Swampland conjecture through inflationary predictions.

Findings

Model aligns with CMB data but requires very small coupling parameter.

Upper bound on coupling parameter challenges the Swampland conjecture.

Results suggest tension between the model and the conjecture.

Abstract

We study a two-field model where a quintessence field with an exponential potential $e^{-\beta\phi/M_P}$ is coupled to the Higgs field. It is claimed that this model is consistent with the proposed Swampland conjecture. We check this claim by calculating its inflationary observables. Although, these observables are in good agreement with the latest CMB data, but we find an upper bound $\beta \lesssim 8\times 10^{-3}$ that strongly disfavors the Swampland conjecture.