Schwarz-preconditioned HMC algorithm for two-flavor lattice QCD

The combination of a non-overlapping Schwarz preconditioner and the Hybrid Monte Carlo (HMC) algorithm is shown to yield an efficient simulation algorithm for two-flavor lattice QCD with Wilson quarks. Extensive tests are performed, on lattices of size up to 32×243, with lattice spacings a≃0.08fm and at bare current-quark masses as low as 21MeV.