Variance reduction via deflation with local coherence
High Energy Physics - Lattice
2024-01-29 v1
Abstract
In large enough volumes, translation-averaging for quark-line connected diagrams reduces the variance inversely proportional to the volume. Stochastic estimators which implement translation averaging however introduce new sources of fluctuations, which in some cases can be relatively large. In this work, we explore whether inexact deflation subspaces can be used to improve the precision of the isovector vector correlators. We perform numerical experiments with non-perturbatively -improved Wilson fermions and measure the relative contribution from the deflation subspace to the central value and the corresponding variance.
Cite
@article{arxiv.2401.14724,
title = {Variance reduction via deflation with local coherence},
author = {Roman Gruber and Tim Harris and Marina Krstić Marinković},
journal= {arXiv preprint arXiv:2401.14724},
year = {2024}
}