Orbital Ferromagnetism and Quantum Collapse in Stellar Plasmas

TL;DR

This paper investigates quantum collapse and nonlinear excitations in dense stellar plasmas with Landau orbital ferromagnetism, revealing how magnetic fields influence star stability and collapse mechanisms in white dwarfs.

Contribution

It introduces a quantum magnetohydrodynamics model incorporating spin effects to analyze ferromagnetism and quantum collapse in stellar plasmas, aligning with observed magnetic fields in white dwarfs.

Findings

Quantum collapse is consistent with magnetic field and density ranges in white dwarfs.

Magnetosonic wave behavior differs significantly between non-relativistic and relativistic regimes.

Ferromagnetic field values match earlier estimates, supporting the model's validity.

Abstract

The possibility of quantum collapse and characteristics of nonlinear localized excitations is examined in dense stars with Landau orbital ferromagnetism in the framework of conventional quantum magnetohydrodynamics (QMHD) model including Bohm force and spin-orbit polarization effects. Employing the concepts of effective potential and Sagdeev pseudopotential, it is confirmed that the quantum collapse and Landau orbital ferromagnetism concepts are consistent with the magnetic field and mass-density range present in some white dwarf stars. Furthermore, the value of ferromagnetic-field found in this work is about the same order of magnitude as the values calculated earlier. It is revealed that the magnetosonic nonlinear propagations can behave much differently in the two distinct non-relativistic and relativistic degeneracy regimes in a ferromagnetic dense astrophysical object. Current findings should help to understand the origin of the most important mechanisms such as gravitational collapse and the high magnetic field present in many compact stars.