Logarithmic link smearing for full QCD
arXiv:0709.4110 · doi:10.1016/j.cpc.2009.02.013
Abstract
A Lie-algebra based recipe for smoothing gauge links in lattice field theory is presented, building on the matrix logarithm. With or without hypercubic nesting, this LOG/HYL smearing yields fat links which are differentiable w.r.t. the original ones. This is essential for defining UV-filtered ("fat link") fermion actions which may be simulated with a HMC-type algorithm. The effect of this smearing on the distribution of plaquettes and on the residual mass of tree-level O(a)-improved clover fermions in quenched QCD is studied.
29 pages, 7 figures; v2: improved text, includes comparison of APE/EXP/LOG with optimized parameters, 3 references added
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