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arXiv · 2512.09052

Neutrinos, B-L Symmetry and the Dark Dimension

Miguel Montero·Cumrun Vafa·Irene Valenzuela
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Abstract

We consider realizations of a gauged B-L symmetry in the context of the Dark Dimension scenario, where the SM lives on a codimension one brane in 5d spacetime. The B-L can naturally be a bulk gauge symmetery leading to a global symmetry on the SM brane, and have its gauge anomaly canceled by charged bulk modes. This naturally leads to the existence of 3 right-handed neutrinos propagating in the dark dimension. Allowing for Higgsing of B-L by a bulk scalar at the Higgs scale, results in a massive gauge field with $m_{B-L}\sim 100$ GeV and weak coupling $g_{B-L}\sim 10^{-10}$ which is allowed by current bounds. The model also predicts a natural matching $m_\nu\sim m_{KK}\sim\Lambda^{1/4}$, thereby providing a theoretical explanation for the observed coincidence between neutrino masses and the Dark Energy scale. It also predicts a tower of sterile right-handed neutrinos in the $keV$ mass range.

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Miguel Montero, Cumrun Vafa, Irene Valenzuela. 2025-12-09. Neutrinos, B-L Symmetry and the Dark Dimension. https://arxiv.org/abs/2512.09052

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