Quantum field theory of degenerate systems
| dc.creator | Brouder, Christian | |
| dc.date | 2003-07-22 | |
| dc.date.accessioned | 2026-07-07T04:15:31Z | |
| dc.date.available | 2026-07-07T04:15:31Z | |
| dc.description | To set up a self-consistent quantum field theory of degenerate systems, the unperturbed state should be described by a density matrix instead of a pure state. This increases the combinatorial complexity of the many-body equations. Hopf algebraic techniques are used to deal with this complexity and show that the Schwinger-Dyson equations are modified in a non-trivial way. The hierarchy of Green functions is derived for degenerate systems, and the case of a single electron in a two-fold degenerate orbital is calculated in detail. | |
| dc.description | 4 pages, no figure | |
| dc.identifier | https://arxiv.org/abs/hep-th/0307212 | |
| dc.identifier | http://arxiv.org/abs/hep-th/0307212 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/52031 | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Quantum field theory of degenerate systems | |
| dc.type | text |