Electromagnetic bremsstrahlung and energy loss in chiral medium

TL;DR

This paper investigates how a fast charged particle loses energy through electromagnetic bremsstrahlung in a chiral medium, revealing chirality-dependent resonances that enhance energy loss.

Contribution

It introduces a theoretical framework for calculating electromagnetic radiation and energy loss in chiral media, highlighting the role of chirality-dependent resonances.

Findings

Resonances depend on chirality, affecting bremsstrahlung cross sections.

Energy loss is significantly enhanced due to instabilities in the chiral medium.

Derived explicit formulas for cross sections and energy loss in high energy limit.

Abstract

We study electromagnetic radiation by a fast particle carrying electric charge in chiral medium. The medium is homogeneous and isotropic and supports the chiral magnetic current which renders the fermion and photon states unstable. The instability manifests as the chirality-dependent resonances in the bremsstrahlung cross section, which enhance the energy loss in the chiral medium. We compute the corresponding cross sections in the single scattering approximation and derive the energy loss in the high energy approximation.