Electrical conductivity and charge diffusion in thermal QCD from the   lattice
  We present a lattice QCD calculation of the charge diffusion coefficient, the electrical conductivity and various susceptibilities of conserved charges, for a range of temperatures below and above the deconfinement crossover. The calculations include the contributions from up, down and strange quarks. We find that the diffusion coefficient is of the order of 1/(2\pi T) and has a dip around the crossover temperature. Our results are obtained with lattice simulations containing 2+1 dynamical flavours on anisotropic lattices. The Maximum Entropy Method is used to construct spectral functions from correlators of the conserved vector current. 
Gert Aarts, Chris Allton, Alessandro Amato, Pietro Giudice, Simon   Hands and Jon-Ivar Skullerud
hep-lat nucl-th