Impact of large cutoff-effects on algorithms for improved Wilson fermions

Details Impact of large cutoff-effects on algorithms for improved Wilson fermions Impact of large cutoff-effects on algorithms for improved Wilson fermions

2004-05-19

arxiv.org/abs/hep-lat/0405017v2

Comput.Phys.Commun. 165 (2005) 49-58

Physics

High Energy Physics

High Energy Physics - Lattice

19 pages, 12 figures, Sec. 2 extended, few references added. Accepted for publication in Comp. Phys. Comm

Scientific paper

10.1016/j.cpc.2004.09.009

As a feasibility study for a scaling test we investigate the behavior of algorithms for dynamical fermions in the N_f=2 Schroedinger functional at an intermediate volume of 1 fm^4. Simulations were performed using HMC with two pseudo-fermions and PHMC at lattice spacings of approximately 0.1 and 0.07 fm. We show that some algorithmic problems are due to large cutoff-effects in the spectrum of the improved Wilson-Dirac operator and disappear at the smaller lattice spacing. The problems discussed here are not expected to be specific to the Schroedinger functional.

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