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- W2000743486 abstract "(Classical) Boltzmann equations suffer from several shortcomings as compared to their quantum mechanical generalizations, the so-called Kadanoff-Baym equations. Nevertheless, in practical calculations approximations to Boltzmann equations are widely used. A prominent example is the computation of the baryon asymmetry of the universe. In this work, we present a detailed comparison between the Kadanoff-Baym and Boltzmann equations in the framework of a scalar phi4 quantum field theory. We solve the Kadanoff-Baym and the Boltzmann equations numerically in 3 + 1 dimensions and compare their predictions on the evolution of systems out of thermal equilibrium for various initial conditions. The obtained numerical solutions reveal significant discrepancies between both types of equations. Most notably, the universality respected by Kadanoff-Baym equations is severely restricted in the case of Boltzmann equations." @default.
- W2000743486 created "2016-06-24" @default.
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- W2000743486 date "2006-04-01" @default.
- W2000743486 modified "2023-09-26" @default.
- W2000743486 title "Comparing Boltzmann vs. Kadanoff-Baym" @default.
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- W2000743486 doi "https://doi.org/10.1088/1742-6596/35/1/036" @default.
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