CP-violating inflation and its cosmological imprints

TL;DR

This paper explores models with multiple scalar doublets coupled to gravity, where complex CP-violating interactions during inflation influence the matter-antimatter asymmetry observed in the universe.

Contribution

It introduces a novel inflationary model with complex non-minimal couplings that incorporate CP-violation directly into the Higgs-inflaton interactions.

Findings

Inflationary dynamics are affected by complex couplings.

CP-violation impacts particle asymmetries post-inflation.

Potential explanation for baryon asymmetry in the universe.

Abstract

We study models with several $SU(2)$ scalar doublets where the inert doublets have a non-minimal coupling to gravity and play the role of the inflaton. We allow for this coupling to be complex, thereby introducing CP-violation -- a necessary source of the baryon asymmetry -- in the Higgs-inflaton couplings. We investigate the inflationary dynamics of the model and discuss how the CP-violation of the model is imprinted on the particle asymmetries after inflation in the hot big bang universe.