Primordial Dirac Leptogenesis
High Energy Physics - Phenomenology
2025-11-07 v1
Abstract
We present a novel realization of Dirac leptogenesis based on the post-inflationary reheating phase of the early universe. An asymmetry generated within the scalar sector via CP-violating and out-of-equilibrium inflaton decays is transferred to chiral neutrinos through Yukawa interactions and then to baryons via electroweak sphalerons. We describe in detail a minimal realization of this mechanism that naturally accommodates small neutrino Yukawa couplings and results in contributions to the effective number of relativistic species, , testable in upcoming cosmological observations.
Keywords
Cite
@article{arxiv.2511.03794,
title = {Primordial Dirac Leptogenesis},
author = {Aqeel Ahmed and Juan P. Garcés and Manfred Lindner},
journal= {arXiv preprint arXiv:2511.03794},
year = {2025}
}