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From quantum field theory to hydrodynamics: Transport coefficients and effective kinetic theory

1995/12/09 by Sangyong Jeon, Laurence G. Yaffe · 27 citations
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #hep-ph

paper · pdf · doi:10.1103/physrevd.53.5799

published as Phys.Rev. D53 (1996) 5799-5809 · 27 pages, revtex format, 5 postscript figures included using epsf.sty

arxiv created 1995/12/09 · openalex publication_date 1996/05/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The evaluation of hydrodynamic transport coefficients in relativistic field theory, and the emergence of an effective kinetic theory description, is examined. Even in a weakly coupled scalar field theory, interesting subtleties arise at high temperatures where thermal renormalization effects are important. In this domain, a kinetic theory description in terms of the fundamental particles ceases to be valid, but one may derive an effective kinetic theory describing excitations with temperature dependent properties. While the shear viscosity depends on the elastic scattering of typical excitations whose kinetic energies are comparable to the temperature, the bulk viscosity is sensitive to particle nonconserving processes at small energies. As a result, the shear and the bulk viscosities have very different dependence on the interaction strength and temperature, with the bulk viscosity providing an especially sensitive test of the validity of an effective kinetic theory description.

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