The neutrino magnetic moment and supernovae with strong magnetic fields
Abstract
Despite several decades of searches, the neutrino magnetic moment remains unknown. If it is large, the neutrino evolution can be affected by its coupling to strong magnetic fields like the ones present in at least some core-collapse supernovae. We explore these effects for Majorana neutrinos. We first discuss a schematic model often employed and show the impact of resonant spin-flavor precession on the neutrino signal for a future galactic supernova. Then, we consider detailed simulations of a neutrino-driven supernova with 17 M⊙ leaving a neutron star and a magnetorotational supernova with 26 M⊙ with a black-hole remnant. We present predictions for the supernova neutrino fluxes and the event rates in presence of a non-zero neutrino magnetic moment, for the running JUNO and upcoming Hyper-Kamiokande experiments. Our results show a significant impact for transition magnetic moments of 10−14 μB during the neutronization burst and the accretion phase for the neutrino driven supernova, and as small as 10−15 μB at the early times for the magnetorotational supernova.
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BibTeX
@misc{ehrhardt2026neutrino,
title = {{The neutrino magnetic moment and supernovae with strong magnetic fields}},
author = {Clément Ehrhardt and Maria Cristina Volpe and Miguel Ángel Aloy and Martin Obergaulinger},
howpublished = {HAL},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08139},
eprint = {2610.08139},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05829867v1},
}
RIS
TY - UNPB
TI - The neutrino magnetic moment and supernovae with strong magnetic fields
AU - Clément Ehrhardt
AU - Maria Cristina Volpe
AU - Miguel Ángel Aloy
AU - Martin Obergaulinger
PY - 2026
DA - 2026/10/06
PB - HAL
DO - 10.48550/arxiv.2610.08139
UR - https://hal.science/hal-05829867v1
AB - Despite several decades of searches, the neutrino magnetic moment remains unknown. If it is large, the neutrino evolution can be affected by its coupling to strong magnetic fields like the ones present in at least some core-collapse supernovae. We explore these effects for Majorana neutrinos. We first discuss a schematic model often employed and show the impact of resonant spin-flavor precession on the neutrino signal for a future galactic supernova. Then, we consider detailed simulations of a neutrino-driven supernova with 17 M_⊙ leaving a neutron star and a magnetorotational supernova with 26 M_⊙ with a black-hole remnant. We present predictions for the supernova neutrino fluxes and the event rates in presence of a non-zero neutrino magnetic moment, for the running JUNO and upcoming Hyper-Kamiokande experiments. Our results show a significant impact for transition magnetic moments of 10^−14 μ_B during the neutronization burst and the accretion phase for the neutrino driven supernova, and as small as 10^−15 μ_B at the early times for the magnetorotational supernova.
ER -