Shear viscosity of hot scalar field theory in the real-time formalism

Details Shear viscosity of hot scalar field theory in the real-time formalism Shear viscosity of hot scalar field theory in the real-time formalism

2002-01-16

arxiv.org/abs/hep-th/0201116v2

Phys.Rev.D67:025022,2003

Physics

High Energy Physics

High Energy Physics - Theory

Expanded introduction and conclusions. Several references and a footnote added. Fig.5 and its discussion in the text modified

Scientific paper

10.1103/PhysRevD.67.025022

Within the closed time path formalism a general nonperturbative expression is derived which resums through the Bethe-Salpter equation all leading order contributions to the shear viscosity in hot scalar field theory. Using a previously derived generalized fluctuation-dissipation theorem for nonlinear response functions in the real-time formalism, it is shown that the Bethe-Salpeter equation decouples in the so-called (r,a) basis. The general result is applied to scalar field theory with pure lambda*phi**4 and mixed g*phi**3+lambda*phi**4 interactions. In both cases our calculation confirms the leading order expression for the shear viscosity previously obtained in the imaginary time formalism.

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