Domain decomposition improvement of quark propagator estimation
arXiv:hep-lat/0607029 · doi:10.1016/j.cpc.2006.09.001
Abstract
Applying domain decomposition to the lattice Dirac operator and the associated quark propagator, we arrive at expressions which, with the proper insertion of random sources therein, can provide improvement to the estimation of the propagator. Schemes are presented for both open and closed (or loop) propagators. In the end, our technique for improving open contributions is similar to the ``maximal variance reduction'' approach of Michael and Peisa, but contains the advantage, especially for improved actions, of dealing directly with the Dirac operator. Using these improved open propagators for the Chirally Improved operator, we present preliminary results for the static-light meson spectrum. The improvement of closed propagators is modest: on some configurations there are signs of significant noise reduction of disconnected correlators; on others, the improvement amounts to a smoothening of the same correlators.
19 pages, 8 figures, version to appear in Computer Physics Communications
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Cited by in corpus (8)
- Effective noise reduction techniques for disconnected loops in Lattice QCD
- Excitations of single-beauty hadrons
- The continuum limit of the static-light meson spectrum
- Radial and orbital excitations of static-light mesons
- B-meson spectroscopy in HQET at order 1/m
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