Plasma Effects on Lasing of Uniform Ultralight Axion Condensate

TL;DR

This paper investigates how background plasma influences the photon lasing process of ultralight axion condensates near black holes, highlighting the importance of plasma properties on axion-photon interactions.

Contribution

It analyzes the effects of plasma on axion condensate lasing, focusing on the conditions near stellar mass black holes where plasma frequency matches axion mass.

Findings

Plasma presence can enhance or suppress axion lasing depending on its properties.

The plasma around black holes significantly affects the axion-photon coupling dynamics.

Conditions for efficient lasing are determined by the relation between axion mass and plasma frequency.

Abstract

Lasing of ultralight axion condensate into photons can be sensitive to the presence of a background plasma owing to its coupling to electromagnetism. Such a scenario is particularly relevant for superradiant axion condensate around stellar mass black holes since the axion mass can be within a few orders of magnitude of the plasma frequency of the surrounding medium. In this paper I discuss the properties of the plasma around a black hole and analyze its effects on the lasing of a uniform axion condensate of mass of the order of the plasma frequency.