Dyson-Schwinger equation constraints on the gluon propagator in BRST quantised QCD

Understand

The gluon propagator plays a central role in determining the dynamics of QCD.

• In this work we demonstrate for BRST quantised QCD that the Dyson-Schwinger equation imposes significant analytic constraints on the structure of this propagator.
• In particular, we find that these constraints control the appearance of massless components in the gluon spectral density.