Dynamics of Monopoles and Flux Tubes in Two-Flavor Dynamical QCD

TL;DR

This paper explores how the inclusion of dynamical quarks affects the confining properties of the QCD vacuum, focusing on monopoles and flux tubes, and compares these with quenched QCD results.

Contribution

It provides a detailed comparison of monopole and flux tube properties in dynamical versus quenched QCD using improved Wilson fermions.

Findings

Differences observed between quenched and dynamical QCD vacua.

Monopole density and screening length vary with dynamical quarks.

Effective monopole action derived for the dynamical case.

Abstract

We investigate the confining properties of the QCD vacuum with $N_f=2$ flavors of dynamical quarks, and compare the results with the properties of the quenched theory. We use non-perturbatively $\mathcal{O}(a)$ improved Wilson fermions to keep cut-off effects small. We focus on color magnetic monopoles. Among the quantities we study are the monopole density and the monopole screening length, the static potential and the profile of the color electric flux tube. We furthermore derive the low-energy effective monopole action. Marked differences between the quenched and dynamical vacuum are found.