Journal Article

FZJ-2019-01076

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preconditioning of improved and “perfect” fermion actions

Bietenholz, W. ; Eicker, N.FZJ* ; Frommer, A. ; Lippert, T.FZJ* ; Medeke, B. ; Schilling, K.Extern* ; Weuffen, G.

1999
North Holland Publ. Co. Amsterdam

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Please use a persistent id in citations: doi:10.1016/S0010-4655(98)00187-8

Abstract: We construct a locally-lexicographic SSOR preconditioner to accelerate the parallel iterative solution of linear systems of equations for two improved discretizations of lattice fermions: (i) the Sheikholeslami-Wohlen scheme Where a non-constant block-diagonal term is added to the Wilson fermion matrix and (ii) renormalization group improved actions which incorporate couplings beyond nearest neighbors of the lattice fermion fields. In case (i) we find the block ll-SSOR-scheme to be more effective by a factor ≈ 2 than odd-even preconditioned solvers in terms of convergence rates, at β = 6.0. For type (ii) actions, we show that our preconditioner accelerates the iterative solution of a linear system of hypercube fermions by a factor of 3 to 4.

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