Topologically Unquenched QCD: Prospects from an explorative study in 2-flavour QED(2)

TL;DR

This study explores a novel simulation approach for a variant of QCD using 2-flavour QED(2), which approximates full QCD dynamics more efficiently than traditional quenched methods.

Contribution

It introduces an importance sampling method that incorporates sea quark effects via global gluonic quantities, offering a promising alternative to quenched approximations in lattice QCD simulations.

Findings

The method generates ensembles between quenched and full QCD with similar computational costs.

It demonstrates potential for more accurate QCD simulations by including sea quark effects.

The approach is tested successfully in the 2-flavour Schwinger model.

Abstract

The concept of simulating a variant of QCD with sea quarks which interact with the gluon configuration only via global gluonic quantities like $\int F\tilde F dx$ and $\int FF dx$ is tested for the case of the massive 2-flavour Schwinger model. It is found to amount to an importance sampling method which generates -at essentially the costs of a quenched run- an ensemble in between a full and a quenched one, thus providing a competitive alternative to the quenched approximation.