dorsal/arxiv
View SchemaThe two-particle problem in a many-particle system: I. Dynamically screened ladder approximation
| Authors | Th. Bornath, D. Kremp, M. Schlanges |
|---|---|
| Categories | |
| ArXiv ID | physics/9903039 |
| URL | https://arxiv.org/abs/physics/9903039 |
Abstract
The two-particle problem within a nonequilibrium many-particle system is investigated in the framework of real-time Green's functions. Starting from the dynamically screened ladder approximation of the nonequlibrium Bethe-Salpeter equation, a nonequilibrium Dyson equation is given for two-time two-particle Green's functions. Thereby the well-known Kadanoff-Baym equations are generalized to the case of two-particle functions. The two-time structure of the equations is achieved in an exact way avoiding the so-called Shindo approximation. For the case of thermodynamic equilibrium, the differences to former results obtained for the effective two-particle hamiltonian are discussed.
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"abstract": "The two-particle problem within a nonequilibrium many-particle system is\ninvestigated in the framework of real-time Green\u0027s functions. Starting from the\ndynamically screened ladder approximation of the nonequlibrium Bethe-Salpeter\nequation, a nonequilibrium Dyson equation is given for two-time two-particle\nGreen\u0027s functions. Thereby the well-known Kadanoff-Baym equations are\ngeneralized to the case of two-particle functions. The two-time structure of\nthe equations is achieved in an exact way avoiding the so-called Shindo\napproximation. For the case of thermodynamic equilibrium, the differences to\nformer results obtained for the effective two-particle hamiltonian are\ndiscussed.",
"arxiv_id": "physics/9903039",
"authors": [
"Th. Bornath",
"D. Kremp",
"M. Schlanges"
],
"categories": [
"physics.plasm-ph"
],
"title": "The two-particle problem in a many-particle system: I. Dynamically screened ladder approximation",
"url": "https://arxiv.org/abs/physics/9903039"
},
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