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

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arxiv hep-ph/9910367 v2 pith:4YABTONJ submitted 1999-10-16 hep-ph hep-th

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

classification hep-ph hep-th
keywords bethe-salpeterequationreal-timesheartheorytimeviscositycalculate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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Cited by 3 Pith papers

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    hep-ph 2026-07 conditional novelty 4.0

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  3. Spin dynamics and polarization in relativistic systems: recent developments

    nucl-th 2026-05 unverdicted novelty 1.0

    The review summarizes developments in spin hydrodynamics, polarization from spin-vorticity coupling, pseudo-gauge freedom, and heavy-flavor spin dynamics in relativistic systems.