Resonant Leptogenesis and Verifiable Seesaw from Large Extra Dimensions
Pei-Hong Gu

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.
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