Nonequilibrium axial charge production in expanding glasma flux tubes

TL;DR

This paper investigates early axial charge production in heavy-ion collisions using real-time lattice simulations of expanding glasma flux tubes, demonstrating the axial anomaly in a lattice framework.

Contribution

It introduces a lattice simulation approach for axial charge production in expanding glasma flux tubes, incorporating the axial anomaly in a real-time, expanding geometry.

Findings

Axial charge production is modeled in expanding glasma flux tubes.

The axial anomaly is successfully realized on the real-time lattice.

Simulations show the evolution of quantum quark fields under classical gauge fields.

Abstract

Axial charge production at the early stage of heavy-ion collisions is investigated within the framework of real-time lattice simulations at leading order in QCD coupling. Starting from color glass condensate initial conditions, the time evolution of quantum quark fields under classical color gauge fields is computed on a lattice in longitudinally expanding geometry. We consider simple color charge distributions in Lorentz contracted nuclei that realize flux tube-like configurations of color fields carrying nonzero topological charge after a collision. By employing the Wilson fermion extended to the longitudinally expanding geometry, we demonstrate the realization of the axial anomaly on the real-time lattice.