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Article

Asymmetry in the Mean Free Path of Neutrinos in Hot Neutron Matter Under Strong Magnetic Fields

by
Eduardo Bauer
1,2,* and
Vanesa D. Olivera
2
1
Institute of Physics, IFLP-CONICET, diag 113 e/63-64, La Plata 1900, Argentina
2
Facultad de Ciencias Astronómicas y Geofísicas, Paseo del Bosque s/n, La Plata 1900, Argentina
*
Author to whom correspondence should be addressed.
Symmetry 2025, 17(6), 896; https://doi.org/10.3390/sym17060896
Submission received: 28 April 2025 / Revised: 28 May 2025 / Accepted: 4 June 2025 / Published: 6 June 2025
(This article belongs to the Special Issue Neutrino Physics and Symmetries)

Abstract

We investigate the asymmetry in the mean free path of massive neutrinos propagating through hot neutron matter under strong magnetic fields. The system is studied at temperatures up to 30 MeV and baryon densities up to ρ/ρ0=2.5, where ρ0 is the nuclear saturation density. Magnetic field strengths up to B=1018 G are considered. We analyze three different equations of state: one corresponding to a non-interacting Fermi gas and two derived from Skyrme-type interactions. The impact of a finite neutrino mass is assessed and found to be negligible within the energy range considered. The neutrino mean free path is computed for various angles of incidence with respect to the magnetic field direction, revealing a clear angular asymmetry. We show that quantum interference terms contribute significantly to this asymmetry, enhancing neutrino emission in directions perpendicular to the magnetic field at high densities. This result contrasts with previous expectations and suggests a revised interpretation of neutrino transport in magnetized nuclear matter.
Keywords: a Asymmetry in the neutrino mean free path; equation of state of stellar matter; the pulsar kick problem; impact of neutrino oscillations a Asymmetry in the neutrino mean free path; equation of state of stellar matter; the pulsar kick problem; impact of neutrino oscillations

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MDPI and ACS Style

Bauer, E.; Olivera, V.D. Asymmetry in the Mean Free Path of Neutrinos in Hot Neutron Matter Under Strong Magnetic Fields. Symmetry 2025, 17, 896. https://doi.org/10.3390/sym17060896

AMA Style

Bauer E, Olivera VD. Asymmetry in the Mean Free Path of Neutrinos in Hot Neutron Matter Under Strong Magnetic Fields. Symmetry. 2025; 17(6):896. https://doi.org/10.3390/sym17060896

Chicago/Turabian Style

Bauer, Eduardo, and Vanesa D. Olivera. 2025. "Asymmetry in the Mean Free Path of Neutrinos in Hot Neutron Matter Under Strong Magnetic Fields" Symmetry 17, no. 6: 896. https://doi.org/10.3390/sym17060896

APA Style

Bauer, E., & Olivera, V. D. (2025). Asymmetry in the Mean Free Path of Neutrinos in Hot Neutron Matter Under Strong Magnetic Fields. Symmetry, 17(6), 896. https://doi.org/10.3390/sym17060896

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