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- W3215605631 abstract "Nonequilibrium quantum field theory is often used to derive an approximation for the evolution of number densities and asymmetries in astroparticle models when a more precise treatment of quantum thermal effects is required. This work presents an alternative framework using the zero-temperature quantum field theory, $S$-matrix unitarity, and classical Boltzmann equation as starting points leading to a set of rules for calculations of thermal corrections to reaction rates. Statistical factors due to on-shell intermediate states are obtained from the cuts of forward diagrams with multiple spectator lines. It turns out that it is equivalent to cutting closed diagrams on a cylindrical surface." @default.
- W3215605631 created "2021-12-06" @default.
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- W3215605631 date "2021-12-01" @default.
- W3215605631 modified "2023-10-16" @default.
- W3215605631 title "Cutting rules on a cylinder: a simplified diagrammatic approach to quantum kinetic theory" @default.
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- W3215605631 doi "https://doi.org/10.1140/epjc/s10052-021-09874-3" @default.
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