Two-flavor QCD simulation with exact chiral symmetry

TL;DR

This paper reports on lattice QCD simulations with two flavors of overlap quarks that preserve chiral symmetry exactly, demonstrating feasibility on large, fine lattices with improved algorithms.

Contribution

It introduces a practical approach to simulate two-flavor QCD with exact chiral symmetry using overlap fermions on large lattices with algorithmic enhancements.

Findings

Successful simulation on a 16^3×32 lattice at 0.12 fm

Exploration of sea quark masses down to m_s/6

Results for static quark potential and operator locality

Abstract

We perform numerical simulations of lattice QCD with two flavors of dynamical overlap quarks, which have exact chiral symmetry on the lattice. While this fermion discretization is computationally demanding, we demonstrate the feasibility to simulate reasonably large and fine lattices by a careful choice of the lattice action and algorithmic improvements. Our production runs are carried out on a 16^3 \times 32 lattice at a single lattice spacing around 0.12 fm. We explore the sea quark mass region down to m_s/6, where m_s is the physical strange quark mass, for a good control of the chiral extrapolation in future calculations of physical observables. We describe in detail our setup and algorithmic properties of the production simulations and present results for the static quark potential to fix the lattice scale and the locality of the overlap operator.