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Kramers Equation Algorithm with Kogut-Susskind Fermions on Lattice
We compare the performance of the Kramers Equation Monte Carlo (KMC)
Algorithm with that of the Hybrid Monte Carlo (HMC) algorithm for numerical
simulations with dynamical Kogut-Susskind fermions. Using the lattice
Gross-Neveu model in 2 space-time dimensions, we calculate the integrated
autocorrelation time of different observables at a number of couplings in the
scaling region on 16^2 and 32^2 lattices while varying the parameters of the
algorithms for optimal performance. In our investigation the performance of KMC
is always significantly below than that of HMC for the observables used. We
also stress the importance of having a large number of configurations for the
accurate estimation of the integrated autocorrelation time.Comment: revised version to appear in Phys. Lett. B, 9 pages, 3 ps figure
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