Excitation of Langmuir waves in the magnetospheres of AGN

TL;DR

This paper investigates how Langmuir waves are excited in the magnetospheres of AGN, revealing an efficient energy transfer process that could explain particle acceleration and plasma heating near supermassive black holes.

Contribution

It introduces a relativistic model for Langmuir wave excitation in AGN magnetospheres, analyzing instability growth rates considering Kerr black hole parameters.

Findings

Parametric energy pumping into Langmuir waves is highly efficient.

Electrostatic field amplitude grows exponentially, indicating strong wave excitation.

Results suggest potential mechanisms for pair creation and plasma heating in AGN environments.

Abstract

In the paper we study the process of excitation of Langmuir waves in the magnetospheres of active galactic nuclei (AGN), by taking a general-relativistic expression of the Goldreich-Julian density into account. We considered the linearised set of equations which describe dynamics of the studied mechanism: the Euler equation, the continuity equation and the Poisson equation. After solving the dispersion relation and obtaining the instability growth rate, we explored it versus several physical parameters: electron's and proton's relativistic factors and the mass and luminosity of AGN, which are supposed to be Kerr black holes. We showed that the parametric process of energy pumping into the Langmuir waves is very efficient and the electrostatic field's amplitude will be exponentially amplifying, which might account for pair creation, particle acceleration and plasma heating processes in the nearby regions of AGN.