Resonant Leptogenesis and Verifiable Seesaw from Large Extra Dimensions

TL;DR

This paper explores how large extra dimensions enable TeV-scale resonant leptogenesis and a verifiable type-II seesaw mechanism, with small parameters generated through lepton number violation propagation from distant branes.

Contribution

It introduces a scenario where small parameters for leptogenesis and seesaw are simultaneously generated via lepton number violation in large extra dimensions.

Findings

TeV-scale Majorana fermions can realize resonant leptogenesis.

A TeV-scale Higgs triplet can produce a verifiable seesaw.

Small parameters are generated by lepton number violation propagation.

Abstract

In the presence of large extra dimensions, the fundamental scale could be as low as a few TeV. This yields leptogenesis and seesaw at a TeV scale. Phenomenologically two TeV-scale Majorana fermions with a small mass split can realize a resonant leptogenesis whereas a TeV-scale Higgs triplet with a small trilinear coupling to the standard model Higgs doublet can give a verifiable seesaw. We propose an interesting scenario where the small parameters for the resonant leptogenesis and the type-II seesaw can be simultaneously generated by the propagation of lepton number violation from distant branes to our world.