1999/10/31 by Enke Wang, Ulrich Heinz · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Theoretical and Computational Physics #hep-ph #hep-th
paper · pdf · doi:10.1016/s0370-2693(99)01324-6
published as Phys.Lett.B471:208-213,1999 · 4 pages LateX. The 2 postscript figures are now incorporated into the text, facilitating download. No other changes. Accepted by Physics Letters B
arxiv created 1999/11/10 · openalex publication_date 1999/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Starting from the Kubo formula we calculate the shear viscosity in hot phi**4 theory nonperturbatively by resumming ladders with a real-time version of the Bethe-Salpeter equation at finite temperature. In the weak coupling limit, the generalized Fluctuation-Dissipation Theorem is shown to decouple the Bethe-Salpeter equations for the different real-time components of the 4-point function. The resulting scalar integral equation is identical with the one obtained by Jeon using diagrammatic ``cutting rules'' in the Imaginary Time Formalism.