Running a Code for Lattice Quantum Chromodynamics Efficiently on CRAY T3E Systems
Angewandte Mathematik, Interner Bericht · 1998
Thenumericalinvestigationof quantumchromodynamics(QCD) ona four-dimensionalspace-time grid is one of the grand challengesin high-performancescientific computing[1,2]. QCD is considered to be the fundamental theory of strongly interacting particles.After 20 years of research, the strong coupling regime of QCD [3] still has not beensolved in a non-perturbative analytical approach, and it isby now widely believed thatthe numerical treatment of the theory on the lattice using very fast parallel supercom-puters is the only viable scheme to extract quantitative physical results [4]. The resultsfrom lattice gaugetheory (LGT) simulations are urgentlyneeded as theoretical input forcurrent and future accelerator experiments that attempt to observe new physics beyondthe Standard Model of elementary particle physics [5].LGT computes functional integrals using Monte Carlo methods known from sta-tistical physics [6]. A representative ensemble of field con figurations is generated bya Markov process (simulation phase). These configurations a re subsequently analysedby composing (and averaging over) hadronic correlators from quark Green’s functions(analysis phase). The correlators then serve to extract physical observables like hadronmasses and decay constants.