PreprintarXiv licencearXiv
Cosmology & Astrophysics of the Dark Dimension with Bulk Majorana Neutrinos
Abstract
Recently, the possibility of having sterile Majorana neutrinos charged under B−L gauge symmetry in the bulk of the dark dimension has been explored. We point out a cosmological restriction on the Majorana mass of bulk neutrinos leading to mass ≳ 100 GeV. This avoids the over-production of Kaluza-Klein neutrino towers in the early universe thus resolving the cosmological neutrino catastrophe of extra dimension scenarios. If the mass of the bulk neutrino is at the lower end of this bound, it can potentially also explain the recently observed Fermi halo excess on gamma rays through the evaporation of long-lived 5d (i.e. dark) black holes through Hawking radiation to bulk neutrinos, which promptly decay into standard model particles.
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BibTeX
@misc{anchordoqui2026cosmology,
title = {{Cosmology & Astrophysics of the Dark Dimension with Bulk Majorana Neutrinos}},
author = {Luis A. Anchordoqui and Cumrun Vafa},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.15209},
eprint = {2610.15209},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.15209},
}
RIS
TY - UNPB
TI - Cosmology & Astrophysics of the Dark Dimension with Bulk Majorana Neutrinos
AU - Luis A. Anchordoqui
AU - Cumrun Vafa
PY - 2026
DA - 2026/10/10
PB - arXiv
DO - 10.48550/arxiv.2610.15209
UR - https://arxiv.org/abs/2610.15209
AB - Recently, the possibility of having sterile Majorana neutrinos charged under B−L gauge symmetry in the bulk of the dark dimension has been explored. We point out a cosmological restriction on the Majorana mass of bulk neutrinos leading to mass ≳ 100 GeV. This avoids the over-production of Kaluza-Klein neutrino towers in the early universe thus resolving the cosmological neutrino catastrophe of extra dimension scenarios. If the mass of the bulk neutrino is at the lower end of this bound, it can potentially also explain the recently observed Fermi halo excess on gamma rays through the evaporation of long-lived 5d (i.e. dark) black holes through Hawking radiation to bulk neutrinos, which promptly decay into standard model particles.
ER -