 
Summary: ELSEVIER
PROCEEDINGS
SUPPLEMENTS
NuclearPhysicsB (Proc. Suppl.) 119(2003)505.507
www.clsevicr.comllocatc/npc
Transport coefficients from the lattice?*
Gert Aarts and Jose M. Martinez Rescoa
aDepartment of Physics, The Ohio State University, 174 West 18th Avenue, Columbus, OH 43210, USA
The prospects of extracting transport coefficients from euclidean lattice simulations are discussed. Some general
comments on the reconstruction of spectral functions using the Maximal Entropy Method are given as well.
1. In field theory transport coefficients are pro
portional to the slope of appropriate spectral
functions at zero frequency and zero spatial mo
mentum (Kubo relation). Examples are the elec
trical conductivity,
(1)
wherepem(x,Y) = ([am,,&,]) is the spec
tral function associated with the electromagnetic
current j& = 7j$$, and the shear viscosity,
(2)
