PreprintCC BY 4.0arXiv
Decay-Assisted Leptogenesis during Preheating
Abstract
We revisit the non-thermal leptogenesis mechanism during preheating using the quantum Boltzmann equations. This framework allows us to study the production and decay of heavy right-handed neutrinos in a consistent manner. Due to their fermionic nature, right-handed neutrino production can saturate after a few inflaton oscillations when their occupation numbers approach unity. Right-handed neutrino decays can deplete their occupation numbers, allowing more particles to be produced and generating a larger lepton asymmetry. Compared with the case where right-handed neutrinos decay only after production has finished, we find that the final baryon asymmetry can be enhanced by two orders of magnitude.
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BibTeX
@misc{zhao2026decayassisted,
title = {{Decay-Assisted Leptogenesis during Preheating}},
author = {Wenbin Zhao},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.17084},
eprint = {2610.17084},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.17084},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Decay-Assisted Leptogenesis during Preheating
AU - Wenbin Zhao
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.17084
UR - https://arxiv.org/abs/2610.17084
AB - We revisit the non-thermal leptogenesis mechanism during preheating using the quantum Boltzmann equations. This framework allows us to study the production and decay of heavy right-handed neutrinos in a consistent manner. Due to their fermionic nature, right-handed neutrino production can saturate after a few inflaton oscillations when their occupation numbers approach unity. Right-handed neutrino decays can deplete their occupation numbers, allowing more particles to be produced and generating a larger lepton asymmetry. Compared with the case where right-handed neutrinos decay only after production has finished, we find that the final baryon asymmetry can be enhanced by two orders of magnitude.
ER -