Exploring the HMC trajectory-length dependence of autocorrelation times in lattice QCD

Details Exploring the HMC trajectory-length dependence of autocorrelation times in lattice QCD Exploring the HMC trajectory-length dependence of autocorrelation times in lattice QCD

2006-06-02

arxiv.org/abs/hep-lat/0606004v1

Comput.Phys.Commun.176:91-97,2007

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 6 figures

Scientific paper

10.1016/j.cpc.2006.08.002

We study autocorrelation times of physical observables in lattice QCD as a function of the molecular dynamics trajectory length in the hybrid Monte-Carlo algorithm. In an interval of trajectory lengths where energy and reversibility violations can be kept under control, we find a variation of the integrated autocorrelation times by a factor of about two in the quantities of interest. Trajectories longer than conventionally used are found to be superior both in the Nf=0 and Nf=2 examples considered here. We also provide evidence that they lead to faster thermalization of systems with light quarks.

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