Dynamical lattice QCD thermodynamics with domain wall fermions

TL;DR

This paper reports on lattice QCD simulations using domain wall fermions to study thermodynamics and chiral symmetry properties near the phase transition, highlighting the preservation of chiral symmetry at finite lattice spacing.

Contribution

It demonstrates the use of domain wall fermions in finite-temperature QCD simulations, emphasizing their advantage in maintaining chiral symmetry compared to other formulations.

Findings

Axial U(1) symmetry is minimally broken above the phase transition.

Domain wall fermions preserve chiral symmetry at finite lattice spacing.

Ongoing work aims to determine the phase transition's order and properties.

Abstract

We present results from simulations of two flavor QCD thermodynamics at N_t=4 with domain wall fermions. In contrast to other lattice fermion formulations, domain wall fermions preserve the full chiral symmetry of the continuum at finite lattice spacing (up to terms exponentially small in an extra parameter). Just above the phase transition, we find that the axial U(1) symmetry is broken only by a small amount. We discuss an ongoing calculation to determine the order and properties of the phase transition using domain wall fermions, since the global symmetries of the theory are expected to be important here.