Unquenched Gluon Propagator in Landau Gauge
Patrick O. Bowman, Urs M. Heller, Derek B. Leinweber, Maria B., Parappilly, Anthony G. Williams
TL;DR
This study uses lattice QCD to compare quenched and unquenched gluon propagators in Landau gauge, revealing the impact of dynamical quarks on infrared behavior.
Contribution
It provides the first unquenched lattice calculation of the gluon propagator in Landau gauge using 2+1 flavor configurations.
Findings
Dynamical quarks reduce infrared enhancement of the gluon propagator.
Clear differences observed between quenched and unquenched cases.
Results improve understanding of quark effects on gluon dynamics.
Abstract
Using lattice quantum chromodynamics (QCD) we perform an unquenched calculation of the gluon propagator in Landau gauge. We use configurations generated with the AsqTad quark action by the MILC collaboration for the dynamical quarks and compare the gluon propagator of quenched QCD (i.e., the pure Yang-Mills gluon propagator) with that of 2+1 flavor QCD. The effects of the dynamical quarks are clearly visible and lead to a significant reduction of the nonperturbative infrared enhancement relative to the quenched case.
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