Journal Article

PreJuSER-18056

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Brillouin improvement for Wilson fermions

Dürr, S.FZJ* ; Koutsou, G.FZJ*

2011
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/11141  doi:10.1103/PhysRevD.83.114512

Abstract: We present a parameter-free Wilson-type lattice Dirac operator with an 81-point stencil for the covariant derivative and the Laplacian, which attempts to minimize the breaking of rotational symmetry near the boundary of the Brillouin zone. The usefulness of this "Brillouin operator" in practical applications is explored by studying the scaling of pseudoscalar decay constants in quenched QCD, with rather good results in the physical charm region. We also investigate the suitability of this operator as a kernel to the overlap procedure. Here, the resulting overlap operator is found to be cheaper to construct and significantly better localized than the variety with the standard Wilson kernel.

Keyword(s): J

Note: We thank Zoltan Fodor for useful correspondence. Computations were performed on the high-performance cluster JUROPA at JSC, with resources allocated through a NIC grant. Both authors were supported by the SFB TR-55.

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Contributing Institute(s):

1. Jülich Supercomputing Centre (JSC)

Research Program(s):

1. Scientific Computing (FUEK411) (FUEK411)
2. 411 - Computational Science and Mathematical Methods (POF2-411) (POF2-411)

Appears in the scientific report 2011

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