Leptogenesis in Complex Hybrid Inflation

TL;DR

This paper explores a leptogenesis mechanism during hybrid inflation, where a complex scalar field's initial leptonic charge is transferred to standard model leptons via decay processes, potentially explaining matter-antimatter asymmetry.

Contribution

It proposes a novel scenario for leptogenesis involving the decay of the inflaton into ultrarelativistic fermions before waterfall field decay, facilitating leptonic charge transfer.

Findings

Inflaton decay into ultrarelativistic fermions creates a thermal bath.

Leptonic charge transfer occurs through decay of waterfall field to right-handed neutrinos.

The scenario supports leptogenesis during the inflationary epoch.

Abstract

We study the transference of an initial leptonic charge contained in a complex scalar field (waterfall field) at the end of the inflation to the leptons of the standard model and then convert this leptonic charge in baryonic charge by sphaleron process. The proposal is that this is done trough the decay of the complex scalar field particles into the right-handed neutrino which in turn decays into the left-handed lepton doublet and the Higgs field of the standard model. It must be analyzed in what environment the transference is done. We propose that the inflaton (the dominant energy density of the universe) decay into ultrarelativistic fermions before the waterfall field particles decay in the right-handed neutrino, leaving a thermalized bath where the transference of the leptonic asymmetry can be achieved.