Palatini Higgs inflation and the refined dS conjecture

TL;DR

This paper examines the Palatini Higgs inflation model under the refined de Sitter conjecture constraints, concluding it likely resides in the Swampland due to parameter inconsistencies with quantum gravity expectations.

Contribution

It applies the refined de Sitter conjecture to the Palatini Higgs inflation scenario, providing new insights into its viability within quantum gravity frameworks.

Findings

Palatini Higgs inflation parameters are inconsistent with the refined dS conjecture.

The model is likely in the Swampland, not the Landscape.

Constraints from observations challenge the model's compatibility with quantum gravity.

Abstract

The refined de Sitter derivative conjecture provides constraints to potentials that are low energy effective theories of quantum gravity. It can give direct bounds on inflationary scenarios and determine whether the theory is in the Landscape or the Swampland. Any infationary model can be checked by these conditions and non-minimally coupled scalar field theory is not an exception. We consider the Palatini Higgs inflation scenario taking the refined de Sitter derivative conjecture into account. According to the latest cosmological observations from Planck 2018, BICEP2+Keck and the bound of non-minimal coupling parameter {\xi}, we suggest that if the refined dS conjecture does indeed hold, then the Palatini Higgs inflation model cannot be the low energy effective theory of a consistent quantum gravity theory since the two parameters c1 and c2 are much smaller than order 1, which is inconsistent with the refined dS conjecture. Therefore we suggest that it is in the Swampland.