Speeding up Lattice QCD simulations with clover-improved Wilson Fermions

TL;DR

This paper demonstrates a method to significantly accelerate lattice QCD simulations with clover-improved Wilson fermions by splitting the fermion matrix, resulting in over twice the speed for small quark masses.

Contribution

It introduces a novel matrix-splitting technique that reduces computational complexity in Hybrid-Monte-Carlo simulations of dynamical fermions.

Findings

Achieved over a twofold speed-up for small quark masses

Applied the method to two-flavor QCD with clover improvement

Validated the efficiency of the proposed approach

Abstract

We apply a recent proposal to speed up the Hybrid-Monte-Carlo simulation of systems with dynamical fermions to two flavour QCD with clover-improvement. The basic idea of our proposal is to split the fermion matrix into two factors with a reduced condition number each. In the effective action, for both factors a pseudo-fermion field is introduced. For our smallest quark masses we see a speed-up of more than a factor of two compared with the standard algorithm.