Non-equilibrium 2PI potential and its possible application to evaluation of bulk viscosity |
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Authors: | Yu B Ivanov D N Voskresensky |
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Institution: | 1. NRC “Kurchatov Institute”, Moscow, Russia 2. National Research Nuclear University “MEPhI”, Moscow, Russia
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Abstract: | Within non-equilibrium Green’s function technique on the real-time contour and the two-particle irreducible Φ-functional method, a non-equilibrium potential is introduced. It naturally generalizes the conventional thermodynamic potential with which it coincides in thermal equilibrium. Variations of the non-equilibrium potential over respective parameters result in the same quantities as those of the thermodynamic potential but in arbitrary non-equilibrium. In particular, for slightly non-equilibrium inhomogeneous configurations a variation of the non-equilibrium potential over volume is associated with the trace of the non-equilibrium stress tensor. The latter is related to the bulk viscosity. This provides a novel way for evaluation of the bulk viscosity. |
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