Hybrid Monte Carlo and topological modes of full QCD

We investigate the performance of the hybrid Monte Carlo algorithm, the standard algorithm used for lattice QCD simulations involving fermions, in updating non-trivial global topological structures. We find that the hybrid Monte Carlo algorithm has serious problems decorrelating the global topological charge at the values of

\beta

and

m

currently simulated, where continuum physics should be approximately realized. This represents a warning which must be seriously considered when simulating full QCD by hybrid Monte Carlo.

Note:

LaTeX2e, uses elsart.cls (included), amstex package, cite.sty (included). 8 pages, 1 figure. Change to the mass dependence of the autocorrelation and a couple of references changed

fermion: lattice field theory
gauge field theory: SU(2)
charge: topological
numerical methods: Monte Carlo
numerical calculations: Monte Carlo

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Figures(1)

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