Higgs inflation and scalar weak gravity conjecture

TL;DR

This paper investigates various Higgs inflation models in relation to the scalar weak gravity conjecture and the de Sitter swampland conjecture, finding that only Palatini Higgs inflation satisfies both, suggesting it as a viable inflation model.

Contribution

The study compares Higgs inflation, Higgs-Dilaton, and Palatini Higgs inflation models against swampland conjectures, identifying Palatini Higgs inflation as compatible with both.

Findings

Higgs and Higgs-Dilaton models do not satisfy the SWGC.

Palatini Higgs inflation satisfies both the dS swampland and SWGC.

Palatini Higgs inflation is proposed as a realistic inflation model.

Abstract

In this article, we intend to find a specific model which can satisfy the further refining dS swampland conjecture and scalar weak gravity conjecture (SWGC) simultaneously, in particular, Higgs inflation model and its two extensions: Higgs-Dilaton model and Palatini Higgs inflation. We find that although Higgs inflation model and Higgs-Dilaton model could satisfy the further refining dS swampland conjecture, the two models cannot satisfy SWGC and its strong version. While Palatini Higgs inflation could satisfy these conjectures simultaneously. Therefore Palatini Higgs inflation could be a "real" inflation model of the universe.