Higgs inflation and its extensions and the further refining dS swampland conjecture

TL;DR

This paper investigates whether Higgs inflation and its variants comply with a new refined de Sitter swampland conjecture, finding that parameter adjustments allow all three models to satisfy the conjecture, suggesting they could be in the landscape.

Contribution

It extends previous work by testing Higgs inflation models against a newly proposed refined de Sitter swampland conjecture, showing parameter flexibility can ensure compatibility.

Findings

All three models can satisfy the conjecture with parameter tuning.

Models may be in the string landscape if the conjecture holds.

Parameter adjustments are crucial for compatibility.

Abstract

On the one hand, David Andriot and Christoph Roupec proposed an alternative refined de Sitter conjecture, which gives a natural condition on a combination of the first and second derivatives of the scalar potential. On the other hand, in our previous article, we have found that Palatini Higgs inflation model is in strong tension with the refined de Sitter swampland conjecture. Therefore, following our previous research, in this article we examine if Higgs inflation model and its two variations: Palatini Higgs inflation and Higgs-Dilaton model can satisfy the further refining de Sitter swampland conjecture or not. Based on observational data, we find that these three inflationary models can always satisfy this new swampland conjecture if only we adjust the relevant parameters a, b=1-a and q. Therefore,if the further refining de Sitter swampland conjecture does indeed hold, then the three inflationary models might all be in landscape.