Relativistic-Amplitude electromagnetic waves - Beating the "magnetic" barrier

TL;DR

This paper demonstrates that relativistic effects in plasma allow electromagnetic waves to bypass traditional magnetic barriers, making the plasma transparent at low frequencies and enhancing understanding of high-energy astrophysical and laser systems.

Contribution

It reveals how relativistic plasma conditions alter wave dispersion, enabling electromagnetic waves to penetrate plasma regions previously considered reflective or opaque.

Findings

Relativistic plasma waves approach linear wave behavior.

High temperatures reduce the plasma cut-off frequency.

Plasma becomes transparent to low-frequency waves.

Abstract

The dispersion characteristics of an circularly polarized electromagnetic wave of arbitrary amplitude, propagating in a highly (thermally and kinematically) relativistic plasma, are shown to approach those of a linear wave in an unmagnetized, non-relativistic plasma. Further aided by high relativistic temperatures, the cut-off frequency tends to become negligibly small; as a result, waves with frequencies well below the nominal plasma and the cyclotron frequencies find the plasma to be essentially transparent. This relativistic phenomenon may greatly advance our ability to understand and model the dynamics of a large class of astrophysical and laser-produced high energy density systems.