Chiral properties of two-flavor QCD in small volume and at large lattice spacing

TL;DR

This study investigates the chiral properties of two-flavor QCD in small volumes and coarse lattices using dynamical overlap fermions, measuring topological susceptibility, chiral condensate, and meson correlators, and comparing results with theoretical predictions.

Contribution

It provides new simulation data on two-flavor QCD with overlap fermions at large lattice spacing and small volume, including algorithmic improvements and comparisons with quenched results.

Findings

Topological susceptibility and chiral condensate measured at different quark masses.

Agreement of low-lying spectrum with random matrix theory predictions.

Differences observed between dynamical and quenched meson correlators.

Abstract

We present results from simulations of two flavors of dynamical overlap fermions on 8^4 lattices at three values of the sea quark mass and a lattice spacing of about 0.16 fm. We measure the topological susceptibility and the chiral condensate. A comparison of the low-lying spectrum of the overlap operator with predictions from random matrix theory is made. To demonstrate the effect of the dynamical fermions, we compare meson two-point functions with quenched results. Algorithmic improvements over a previous publication and the performance of the algorithm are discussed.