Instabilities and propagation of neutrino magnetohydrodynamic waves in arbitrary direction

TL;DR

This paper generalizes the study of neutrino-magnetohydrodynamic wave instabilities to arbitrary propagation directions, providing a broader understanding of neutrino-plasma interactions in extreme astrophysical environments.

Contribution

It extends previous models by analyzing wave instabilities at any propagation angle, including fast, slow, and oblique magnetohydrodynamic waves.

Findings

Neutrino beam instabilities depend on propagation angle.

Instabilities are significant in dense astrophysical environments.

Results applicable to supernova and neutron star conditions.

Abstract

In a previous work [16], a new model was introduced, taking into account the role of the Fermi weak force due to neutrinos coupled to magnetohydrodynamic plasmas. The resulting neutrino-magnetohydrodynamics was investigated in a particular geometry associated with the magnetosonic wave, where the ambient magnetic field and the wavevector are perpendicular. The corresponding fast, short wavelength neutrino beam instability was then obtained in the context of supernova parameters. The present communication generalizes these results, allowing for arbitrary direction of wave propagation, including fast and slow magnetohydrodynamic waves and the intermediate cases of oblique angles. The numerical estimates of the neutrino-plasma instabilities are derived in extreme astrophysical environments where dense neutrino beams exist.