Nonlinear Coupling of Electromagnetic and Spin-Electron-Acoustic Waves in Spin-polarized Degenerate Relativistic Astrophysical Plasma

TL;DR

This paper investigates how finite amplitude electromagnetic waves interact with spin-electron-acoustic waves in highly dense, spin-polarized degenerate plasmas, revealing conditions for instability and its dependence on plasma density and spin polarization.

Contribution

It introduces a detailed analysis of nonlinear coupling between electromagnetic and spin-electron-acoustic waves in relativistic degenerate plasmas, highlighting the conditions for instability.

Findings

Instability occurs at high plasma densities near Fermi momentum $m_{e}c$.

The instability growth rate increases with plasma spin polarization.

Strongest instability observed in high-density, highly spin-polarized plasmas.

Abstract

Propagation of the finite amplitude electromagnetic wave through the partially spin-polarized degenerate plasmas leads to the instability. The instability happens at the interaction of the electromagnetic wave with the small frequency longitudinal spin-electron-acoustic waves. Strongest instability happens in the high density degenerate plasmas with the Fermi momentum close to $m_{e}c$, where $m_{e}$ is the mass of electron, and $c$ is the speed of light. The increase of the increment of instability with the growth of the spin polarization of plasmas is found.