ar X iv : h ep - l at / 0 20 90 71 v 1 4 S ep 2 00 2 1 Improving the Partial - Global Stochastic Metropolis Update for Dynamical Smeared Link Fermions

We discuss several methods that improve the partial-global stochastic Metropolis (PGSM) algorithm for smeared link staggered fermions. We present autocorrelation time measurements and argue that this update is feasible even on reasonably large lattices. Smeared link actions have gained popularity in recent years. These actions have many desirable features: improved flavor symmetry with staggered fermions, smaller perturbative matching factors, better topology, etc [1]. What hinders the use of these smeared actions is the difficulty of dynamical simulations with standard molecular dynamics type algorithms. Recently it was suggested that even projected smeared link actions can be effectively simulated with partial-global heatbath or over-relaxation updates that are combined with a Metropolis type accept-reject step [2]. In this paper we summarize some of the improvements that make this partial-global stochas-tic Metropolis (PGSM) update truly effective.