Localized Neutrinos in Two Dark Dimensions
Abstract
We study neutrino masses in a six-dimensional framework with two compact dark dimensions. In the conventional flat-bulk realization, the sterile-neutrino zero mode is strongly volume suppressed, so a fundamental scale near 10 TeV requires a large higher-dimensional Yukawa coupling to reproduce the observed neutrino masses, while the accompanying two-dimensional Kaluza--Klein tower is strongly constrained by oscillation data. We show that localizing the sterile-neutrino wave function near the Standard-Model brane substantially alleviates both effects. Using a Gaussian localizer, realistic Dirac neutrino masses are obtained with perturbative, order-one Yukawa couplings, while the brane-visible sterile excitations form a shell spectrum with Ms2=8μ2 s, and squared active--sterile mixings that decrease as 1/s. The localization scale therefore separates the experimentally relevant sterile-neutrino spectrum from the gravitational compactification scale. We derive the resulting three-flavour structure and study its phenomenological consequences for reactor oscillations and tritium beta decay, including comparisons with current flat-LED and KATRIN constraints.
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BibTeX
@misc{ahmed2026localized,
title = {{Localized Neutrinos in Two Dark Dimensions}},
author = {Waqas Ahmed and George K. Leontaris},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.30526},
eprint = {2610.30526},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.30526},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Localized Neutrinos in Two Dark Dimensions
AU - Waqas Ahmed
AU - George K. Leontaris
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.30526
UR - https://arxiv.org/abs/2610.30526
AB - We study neutrino masses in a six-dimensional framework with two compact dark dimensions. In the conventional flat-bulk realization, the sterile-neutrino zero mode is strongly volume suppressed, so a fundamental scale near 10 TeV requires a large higher-dimensional Yukawa coupling to reproduce the observed neutrino masses, while the accompanying two-dimensional Kaluza--Klein tower is strongly constrained by oscillation data. We show that localizing the sterile-neutrino wave function near the Standard-Model brane substantially alleviates both effects. Using a Gaussian localizer, realistic Dirac neutrino masses are obtained with perturbative, order-one Yukawa couplings, while the brane-visible sterile excitations form a shell spectrum with M_s^2=8μ^2 s, and squared active--sterile mixings that decrease as 1/s. The localization scale therefore separates the experimentally relevant sterile-neutrino spectrum from the gravitational compactification scale. We derive the resulting three-flavour structure and study its phenomenological consequences for reactor oscillations and tritium beta decay, including comparisons with current flat-LED and KATRIN constraints.
ER -