Electromagnetic currents induced by color fields

TL;DR

This paper investigates how quark production in classical color fields induces electromagnetic currents, revealing differences between SU(2) and SU(3) theories and exploring photon emission from inhomogeneous color fields.

Contribution

It demonstrates the distinct electromagnetic current induction in SU(2) versus SU(3) color fields and models photon emission from quarks in inhomogeneous color configurations.

Findings

No net electromagnetic current in uniform SU(2) fields.

Net current induced in SU(3) fields depending on color orientation.

Photon spectrum from quark production in inhomogeneous color fields.

Abstract

The quark production in classical color fields is investigated with a focus on the induction of an electromagnetic current by produced quarks. We show that the color SU(2) and the SU(3) theories lead significantly different results for the electromagnetic current. In uniform SU(2) color fields, the net electromagnetic current is not generated, while in SU(3) color fields the net current is induced depending on the color direction of background fields. Also the numerical study of the quark production in inhomogeneous color fields is done. Motivated by gauge field configurations provided by the color glass condensate framework, we introduce an ensemble of randomly distributed color electric fluxtubes. The spectrum of photons emitted from the quarks by a classical process is shown.