Lower-hybrid oscillations in a cold magnetized electron-positron-ion plasma

TL;DR

This paper derives the dispersion relation for lower-hybrid oscillations in a cold magnetized electron-positron-ion plasma, revealing that their frequency is approximately one-third of that in an electron-ion plasma under certain conditions, with implications for laboratory and astrophysical plasmas.

Contribution

It provides the first analytical derivation of the dispersion relation for lower-hybrid waves in a cold e-p-i plasma, highlighting the frequency reduction compared to e-i plasmas.

Findings

Lower-hybrid oscillation frequency is about 1/√3 times that in e-i plasma.

Frequency reduction occurs when positron and ion densities are balanced.

Results are relevant for laboratory and astrophysical plasma studies.

Abstract

In this paper, we obtain the dispersion relation for the lower-hybrid oscillations/waves in a cold magnetized electron-positron-ion (e-p-i) plasma. It is found that the frequency of the lower-hybrid oscillations in an e-p-i plasma is approximate $1/\sqrt{3}$ times the frequency of lower-hybrid oscillations in an electron-ion (e-i) plasma, provided the plasma density is high, and the equilibrium densities of the positron and the ion are balanced. The present work may have some relevance for laboratory/astrophysical e-p-i plasmas.