Nonperturbative calculation of the shear viscosity in hot phi**4 theory in real time

Details Nonperturbative calculation of the shear viscosity in hot phi**4 theory in real time Nonperturbative calculation of the shear viscosity in hot phi**4 theory in real time

1999-10-16

arxiv.org/abs/hep-ph/9910367v2

Phys.Lett.B471:208-213,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages LateX. The 2 postscript figures are now incorporated into the text, facilitating download. No other changes. Accepted

Scientific paper

10.1016/S0370-2693(99)01324-6

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.

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