The quark fluctuation propagator is evaluated. It defines the diffusion coefficient in the vicinity of the phase transition and the gradient term in the Ginzburg-Landau functional.
@article{arxiv.0706.3980,
title = {Fluctuation Propagator and Heavy Quark Diffusion},
author = {B. O. Kerbikov},
journal= {arXiv preprint arXiv:0706.3980},
year = {2007}
}