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arXiv:hepph/0212268 2002 TRANSPORT COEFFICIENTS AND QUANTUM FIELDS
 

Summary: arXiv:hep≠ph/0212268
v1
18
Dec
2002 TRANSPORT COEFFICIENTS AND QUANTUM FIELDS 
GERT AARTS AND JOSE M. MARTINEZ RESCO
Department of Physics, The Ohio State University
174 West 18th Avenue, Columbus, OH 43210, USA
Various aspects of transport coe∆cients in quantum eld theory are reviewed. We
describe recent progress in the calculation of transport coe∆cients in hot gauge
theories using Kubo formulas, paying attention to the ful llment of Ward iden-
tities. We comment on why the color conductivity in hot QCD is much simpler
to compute than the electrical conductivity. The nonperturbative extraction of
transport coe∆cients from lattice QCD calculations is brie y discussed.
1. Introduction
Transport coe∆cients characterize the response of a system in thermal equi-
librium to a weak perturbation associated with a conserved current. Exam-
ples are the shear and bulk viscosities, electrical conductivity and di usion
constants. Transport coe∆cients can be relevant in various physical sce-
narios: in the formation and di usion of large-scale magnetic elds 1 , in

  

Source: Aarts, Gert - Department of Physics, University of Wales Swansea

 

Collections: Physics