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

Harvey B. Meyer·Hubert Simma·Rainer Sommer·Michele Della Morte·Oliver Witzel·Ulli Wolff
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Abstract

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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Harvey B. Meyer, Hubert Simma, Rainer Sommer, Michele Della Morte, Oliver Witzel, Ulli Wolff. 2006-06-02. Exploring the HMC trajectory-length dependence of autocorrelation times in lattice QCD. https://doi.org/10.1016/j.cpc.2006.08.002

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