Scalar boson emission from a magnetized relativistic plasma

TL;DR

This paper studies how a strong magnetic field influences the emission of neutral scalar bosons from a relativistic plasma, revealing new emission processes and angular distribution effects due to Landau-level quantization.

Contribution

It introduces the leading-order processes for scalar boson emission in a magnetized plasma and analyzes the impact of Landau levels on emission rates and angular distributions.

Findings

Magnetic field enables particle splitting and annihilation processes for boson emission.

Emission rates are suppressed along the magnetic field and enhanced perpendicular to it.

Magnetic field significantly increases the total scalar boson emission rate.

Abstract

We investigate the differential emission rate of neutral scalar bosons from a highly magnetized relativistic plasma. We show that three processes contribute at the leading order: particle splitting ($\psi\rightarrow \psi+\phi $), antiparticle splitting ($\bar{\psi} \rightarrow \bar{\psi}+\phi $), and particle-antiparticle annihilation ($\psi + \bar{\psi}\rightarrow \phi $). This is in contrast to the scenario with zero magnetic field, where only the annihilation processes contribute to boson production. We examine the impact of Landau-level quantization on the energy dependence of the rate and investigate the angular distribution of emitted scalar bosons. The differential rate resulting from both (anti)particle splitting and annihilation processes are typically suppressed in the direction of the magnetic field and enhanced in perpendicular directions. Overall, the background magnetic field significantly amplifies the total emission rate. We speculate that our model calculations provide valuable theoretical insights with potentially important applications.