  In these proceedings, we investigate non-perturbative models for Quantum
Chromodynamics (QCD) motivated by the behavior of the Landau-gauge lattice
gluon propagator with the purpose of testing their validity in the perturbative
regime of strong interactions and to explore their behavior in the infrared
region. In particular, we discuss the potentials between heavy quarks and
antiquarks, since this observable might reveal the appearance of confining
properties in these non-perturbative models through a linear growth at large
and intermediate distances.
