Deflation acceleration of lattice QCD simulations

Details Deflation acceleration of lattice QCD simulations Deflation acceleration of lattice QCD simulations

2007-10-29

arxiv.org/abs/0710.5417v1

JHEP0712:011,2007

Physics

High Energy Physics

High Energy Physics - Lattice

Plain TeX source, 15 pages, 2 figures included

Scientific paper

10.1088/1126-6708/2007/12/011

Close to the chiral limit, many calculations in numerical lattice QCD can potentially be accelerated using low-mode deflation techniques. In this paper it is shown that the recently introduced domain-decomposed deflation subspaces can be propagated along the field trajectories generated by the Hybrid Monte Carlo (HMC) algorithm with a modest effort. The quark forces that drive the simulation may then be computed using a deflation-accelerated solver for the lattice Dirac equation. As a consequence, the computer time required for the simulations is significantly reduced and an improved scaling behaviour of the simulation algorithm with respect to the quark mass is achieved.

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