Minimal Seesaw extension for Neutrino Mass and Mixing, Leptogenesis and Dark Matter: FIMPzillas through the Right-Handed Neutrino Portal
Marco Chianese, Bowen Fu, Stephen F. King

TL;DR
This paper introduces a minimal seesaw model extension that simultaneously explains neutrino properties, baryon asymmetry, and dark matter, proposing superheavy FIMPzilla particles produced via right-handed neutrino interactions.
Contribution
It presents a novel minimal seesaw framework linking neutrino physics, leptogenesis, and superheavy dark matter through the right-handed neutrino portal and freeze-in production mechanisms.
Findings
FIMPzilla dark matter can match observed relic density.
Parameter space identified for superheavy dark matter production.
Neutrino Yukawa couplings influence dark matter relic abundance.
Abstract
We propose a minimal seesaw extension to simultaneously account for realistic neutrino mass and mixing, the baryon asymmetry of the Universe via leptogenesis and a viable dark matter relic density, in which two right-handed neutrinos are coupled to a dark Dirac fermion and complex scalar field, both charged under a global symmetry. As a concrete example, we consider the Littlest Seesaw model which describes neutrino mass and mixing and accounts for leptogenesis, thereby fixing the neutrino Yukawa couplings and right-handed neutrino masses. By considering the freeze-in production mechanism of dark matter, we explore the parameter space of right-handed neutrino portal couplings and dark particle masses which give the correct dark matter relic abundance, focussing on the case of a superheavy Dirac fermion dark matter particle, with a mass around GeV. Such a FIMPzilla can…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
