Effective noise reduction techniques for disconnected loops in lattice QCD. (English) Zbl 1215.81120
Summary: Many lattice QCD observables of phenomenological interest include so-called all-to-all propagators. The computation of these requires prohibitively large computational resources, unless they are estimated stochastically. This is usually done. However, the computational demand can often be further reduced by one order of magnitude by implementing sophisticated unbiased noise reduction techniques. We combine both well known and novel methods that can be applied to a wide range of problems. We concentrate on calculating disconnected contributions to nucleon structure functions, as one realistic benchmark example. In particular we determine the strangeness contributions to the nucleon, \(\langle N|\bar ss|N\rangle\) and to the spin of the nucleon, \(\Delta s\).
MSC:
| 81V05 | Strong interaction, including quantum chromodynamics |
| 81T25 | Quantum field theory on lattices |
| 81T80 | Simulation and numerical modelling (quantum field theory) (MSC2010) |
| 81V35 | Nuclear physics |
| 81U35 | Inelastic and multichannel quantum scattering |
Software:
ChromaReferences:
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