Hydrodynamic transport functions from quantum kinetic theory

Abstract

Starting from the quantum kinetic field theory [E. Calzetta and B. L. Hu, Phys. Rev. D37, 2878 (1988)] constructed from the closed-time-path (CTP), two-particle-irreducible (2PI) effective action we show how to compute from first principles the shear and bulk viscosity functions in the hydrodynamic-thermodynamic regime. For a real scalar field with $\lambda {\Phi }^4$ self-interaction we need to include 4 loop graphs in the equation of motion. This work provides a microscopic field-theoretical basis to the ``effective kinetic theory'' proposed by Jeon and Yaffe [S. Jeon and L. G. Yaffe, Phys. Rev. D53, 5799 (1996)], while our result for the bulk viscosity reproduces their expression derived from linear response theory and the imaginary-time formalism of thermal field theory. Though unavoidably involved in calculations of this sort, we feel that the approach using fundamental quantum kinetic field theory is conceptually clearer and methodically simpler than the effective kinetic theory approach, as the success of the latter requires clever rendition of diagrammatic resummations which is neither straightforward nor failsafe. Moreover, the method based on the CTP-2PI effective action illustrated here for a scalar field can be formulated entirely in terms of functional integral quantization, which makes it an appealing method for a first-principles calculation of transport functions of a thermal non-abelian gauge theory, e.g., QCD quark-gluon plasma produced from heavy ion collisions.

25 pages revtex, 11 postscript figures. Final version accepted for publication

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• Self-consistent hard-thermal-loop thermodynamics for the quark-gluon plasma
• From hard thermal loops to Langevin dynamics
• Effective Transport Equations for non-Abelian Plasmas
• Dynamical Renormalization Group Approach to Quantum Kinetics in Scalar and Gauge Theories
• Non-equilibrium quantum plasmas in scalar QED: photon production, magnetic and Debye masses, and conductivity

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