Relativistic degeneracy effect on propagation of arbitrary amplitude ion-acoustic solitons in Thomas-Fermi plasmas

TL;DR

This paper investigates how relativistic degeneracy influences the propagation of ion-acoustic solitary waves in Thomas-Fermi plasmas, revealing significant effects on wave amplitude and Mach-number range, with only compressive waves propagating.

Contribution

It introduces a detailed analysis of relativistic degeneracy effects on arbitrary amplitude IASWs in electron-positron-ion plasmas using the Sagdeev-Potential approach.

Findings

Relativistic degeneracy significantly affects IASW amplitude and Mach-number range.

Only compressive IASWs can propagate in degenerate plasmas.

The study provides numerical criteria for the existence of such solitary waves.

Abstract

Arbitrary amplitude ion-acoustic solitary waves (IASWs) are studied using Sagdeev-Potential approach in electron-positron-ion plasma with ultra-relativistic or non-relativistic degenerate electrons and positrons and the matching criteria of existence of such solitary waves are numerically investigated. It has been shown that the relativistic degeneracy of electrons and positrons has significant effects on the amplitude and the Mach-number range of IASWs. Also it is remarked that only compressive IASWs can propagate in both non-relativistic and ultra-relativistic degenerate plasmas.