Axial current generation by P-odd domains in QCD matter

TL;DR

This paper investigates how topological P-odd domains in QCD can generate axial currents, using theoretical derivations and holographic models, with implications for heavy-ion collision experiments.

Contribution

It provides a general derivation of axial current generation by P-odd domains and verifies it through a holographic model, linking topological dynamics to observable effects.

Findings

Topological P-odd domains induce axial currents in QCD.

The strength of the axial current is quantified theoretically.

Implications for heavy-ion collision experiments are discussed.

Abstract

The dynamics of topological domains which break parity (${\cal P}$) and charge-parity (${\cal CP}$) symmetry of QCD are studied. We derive in a general setting that those local domains will generate an axial current and quantify the strength of the induced axial current. Our findings are verified in a top-down holographic model. The relation between the real time dynamics of those local domains and chiral magnetic effect is also elucidated. We finally argue that such an induced axial current would be phenomenologically important if topological domains are created in heavy-ion collisions experiment.