Majorana Neutrino Physics and Matter-Antimatter Asymmetry in Type IIA String Theory
Abstract
We study Majorana neutrino masses and the matter-antimatter asymmetry in Type IIA string theory on a T6/(ℤ2 × ℤ2) orientifold with intersecting D6-branes. Euclidean D2-instantons with Sp(2) Chan-Paton symmetry generate both the seesaw mechanism and the Weinberg operator. The flavour vectors are not computed from a compactification but fixed by matching, so our results are an existence proof. Matching the measured mass-squared differences selects the seesaw-dominated case with normal ordering. Swampland criteria constrain the instanton action and the reheating temperature. A benchmark example reproduces the neutrino parameters, gives ηB ≈ 8.6 × 10−11, within an order of magnitude of observation, and predicts ⟨ mββ ⟩ =2.594 meV. A parameter scan shows the mass hierarchy is accommodated rather than predicted.
Related
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BibTeX
@misc{liu2026majorana,
title = {{Majorana Neutrino Physics and Matter-Antimatter Asymmetry in Type IIA String Theory}},
author = {Yang Liu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.39804},
eprint = {2610.39804},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.39804},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Majorana Neutrino Physics and Matter-Antimatter Asymmetry in Type IIA String Theory
AU - Yang Liu
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.39804
UR - https://arxiv.org/abs/2610.39804
AB - We study Majorana neutrino masses and the matter-antimatter asymmetry in Type IIA string theory on a T^6/(ℤ_2 × ℤ_2) orientifold with intersecting D6-branes. Euclidean D2-instantons with Sp(2) Chan-Paton symmetry generate both the seesaw mechanism and the Weinberg operator. The flavour vectors are not computed from a compactification but fixed by matching, so our results are an existence proof. Matching the measured mass-squared differences selects the seesaw-dominated case with normal ordering. Swampland criteria constrain the instanton action and the reheating temperature. A benchmark example reproduces the neutrino parameters, gives η_B ≈ 8.6 × 10^−11, within an order of magnitude of observation, and predicts ⟨ m_ββ ⟩ =2.594 meV. A parameter scan shows the mass hierarchy is accommodated rather than predicted.
ER -