Minimal Leptogenesis in Brane-inspired Cosmology

TL;DR

This paper investigates how a nonstandard cosmological reheating phase involving multiple scalar fields in brane-inspired models can alter the conditions for minimal high-scale leptogenesis, impacting the generation of the universe's matter-antimatter asymmetry.

Contribution

It introduces a modified framework for leptogenesis within brane-inspired cosmology, accounting for multiple scalar fields affecting Boltzmann equations and lepton asymmetry.

Findings

Modified Boltzmann equations due to scalar fields

Altered lepton asymmetry production

Implications for high-scale leptogenesis

Abstract

We discuss how a post inflationary reheating phase characterized by a nonstandard multiple scalar field cosmology can change the thermal history of the universe, affecting minimal high scale leptogenesis. In particular, we explore a class of models where a set of scalar fields in a brane-inspired dynamical scenario modifies the Boltzmann equations concerning standard leptogenesis. The produced lepton asymmetry, due to the decays of heavy Majorana right-handed neutrinos responsible for generating Standard Model neutrino masses via the type-I seesaw, is affected as well.