TeV Scale Leptogenesis in B-L Model with Alternative Cosmologies

TL;DR

This paper explores two alternative cosmological scenarios, involving extra-dimensional effects and non-thermal neutrino production, to enable leptogenesis at the TeV scale within a B-L extended standard model.

Contribution

It introduces novel mechanisms to achieve successful leptogenesis at TeV scales, overcoming standard cosmology constraints in B-L models with inverse seesaw.

Findings

Extra-dimensional effects can modify the Friedman equation to facilitate leptogenesis.

A non-thermal neutrino production scenario can generate the baryon asymmetry at TeV scales.

The five-dimensional Planck mass is constrained to around 100 TeV in the braneworld scenario.

Abstract

In TeV scale B-L extension of the standard model with inverse seesaw, the Yukawa coupling of right-handed neutrinos can be of order one. This implies that the out of equilibrium condition for leptogenesis within standard cosmology is not satisfied. We provide two scenarios for overcoming this problem and generating the desired value of the baryon asymmetry of the Universe. The first scenario is based on extra-dimensional braneworld effects that modify the Friedman equation. We show that in this case the value of the baryon asymmetry of the Universe constrains the five-dimensional Planck mass to be of order O(100) TeV. In the second scenario a non-thermal right-handed neutrino produced by the decay of inflaton is assumed. We emphasize that in this case, it is possible to generate the required baryon asymmetry of the Universe for TeV scale right-handed neutrinos.