Leptogenesis: Theory and Neutrino Masses

TL;DR

This paper reviews leptogenesis mechanisms for explaining matter-antimatter asymmetry, covering high and low scale neutrino models, recent quantum approaches, and cosmological implications for dark matter and entropy.

Contribution

It provides a comprehensive overview of leptogenesis theories, including recent quantum treatments and cosmological scenarios involving B-L breaking.

Findings

Resonant leptogenesis advances quantum description of matter asymmetry.

Low-scale neutrino models can account for dark matter and baryon asymmetry.

Cosmological B-L breaking post-inflation can generate entropy, baryon asymmetry, and dark matter.

Abstract

After a brief discussion of baryon and lepton number nonconservation, we review the status of thermal leptogenesis with GUT scale neutrino masses, as well as low scale alternatives with keV neutrinos as dark matter and heavy neutrino masses within the reach of the LHC. Recent progress towards a full quantum mechnical description of leptogenesis is described with resonant leptogenesis as an application. Finally, cosmological B-L breaking after inflation is considered as origin of the hot early universe, generating entropy, baryon asymmetry and dark matter.