Comparing energy loss and p_⊥-broadening in perturbative QCD with strong coupling N = 4 SYM theory

We compare medium induced energy loss and p_⊥-broadening in perturbative QCD with that of the trailing string picture of SYM theory. We consider finite and infinite extent matter as well as relativistic heavy quarks which correspond to those being produced in the medium or external to it. When expressed in terms of the appropriate saturation momentum, we find identical parametric forms for energy loss in perturbative QCD and SYM theory. We find simple correspondences between p_⊥-broadening in QCD and in SYM theory although p_⊥-broadening is radiation dominated in SYM theory and multiple scattering dominated in perturbative QCD.