Download E-books Operator expectation values, self-energies, cutting rules, and higher-order processes PDF

By Danielewicz P.

The high-order constitution of diagrammatic growth in real-time many-body concept is tested. The life of slicing principles is verified for diagrams that could correspond to the expectancy values of operator items, self-energies, and so on. the principles allow one to precise those amounts, as convolutions of retarded amplitudes with the Green's services such as densities, extending over the last of a many-body process. The quasiparticle restrict of the consequences is mentioned. for example, the resummation is carried over the repeated interactions among excitations in a medium, for the self-energies that correspond to unmarried- particle absorption and creation charges. The imaginary nucleon optical capability, that's utilized in nuclear physics, is similar with the mix of the premiums. additional, the formulae for the absorption and creation premiums of collective excitations are derived.

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