Translation averaging for quark propagators
by
Room 5017
Building U2 - Quantum
Signal-to-noise ratio problems are ubiquitous in lattice QCD calculations and often obstruct the numerical limits required to obtain predictions of the hadronic spectrum or matrix elements at the physical point. One simple way to improve the statistical quality of correlation functions is to average them over the space-time volume. However, for quark propagators such translation averaging is expensive. In this talk I will review how translation averaging can be implemented for quark propagators both at short and long distances, relevant for quark-line disconnected and connected diagrams respectively. In the latter case, an efficient implementation relies on the deflation of the low modes after block projection, as suggested by their local coherence property. Numerical evidence suggests that this ameliorates the poor volume scaling of typical low-mode averaging implementations.
BicQCD