Leptogenesis during Axion Relaxation after Inflation
Kai Schmitz

TL;DR
This paper proposes a minimal alternative to thermal leptogenesis where an axion-like field after inflation creates conditions for baryogenesis, independent of heavy neutrino CP phases, requiring high reheating temperatures.
Contribution
It introduces a novel leptogenesis mechanism driven by axion-like fields, differing from thermal models by its insensitivity to neutrino sector parameters.
Findings
Baryon asymmetry generated is independent of heavy neutrino CP phases.
Requires reheating temperature of at least 10^12 GeV.
Compatible with grand unification scale neutrino masses.
Abstract
In this talk, I present a novel and minimal alternative to thermal leptogenesis, which builds upon the assumption that the electroweak gauge bosons are coupled to an axion-like scalar field, as it is, for instance, the case in certain string compactifications. The motion of this axion-like field after the end of inflation generates an effective chemical potential for leptons and antileptons, which, in the presence of lepton number-violating scatterings mediated by heavy Majorana neutrinos, provides an opportunity for baryogenesis via leptogenesis. In contrast to thermal leptogenesis, the final baryon asymmetry turns out to be insensitive to the masses and CP-violating phases in the heavy neutrino sector. Moreover, the proposed scenario requires a reheating temperature of at least O(10^12) GeV and it is, in particular, consistent with heavy neutrino masses close the scale of grand…
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.
Taxonomy
TopicsParticle physics theoretical and experimental studies · Dark Matter and Cosmic Phenomena · Cosmology and Gravitation Theories
