On quantum field theories with finitely many degrees of freedom
| dc.creator | Kerschner, Ralf | |
| dc.date | 1995-05-11 | |
| dc.date.accessioned | 2026-07-07T04:21:08Z | |
| dc.date.available | 2026-07-07T04:21:08Z | |
| dc.description | The existence of inequivalent representations in quantum field theory with {\it finitely} many degrees of freedom is shown. Their properties are exemplified and analysed for concrete and simple models. In particular the relations to Bogoliubov--Valatin quasi-particles, to thermo field dynamics, and to $q$--deformed quantum theories are put foreward. The thermal properties of the non-trivial vacuum are given and it is shown that the thermodynamic equilibrium state is uniquely obtained by an irreversible vacuum dynamics. Finally, the theory is applied to a realistic model: the BCS--theory of superconductivity. An exact solution in order $O(N^{-1})$ for the full particle number conserving BCS--Hamiltonian with particle number symmetric ground state is given. | |
| dc.description | 22 pages, LateX | |
| dc.identifier | https://arxiv.org/abs/hep-th/9505063 | |
| dc.identifier | http://arxiv.org/abs/hep-th/9505063 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/54196 | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | On quantum field theories with finitely many degrees of freedom | |
| dc.type | text |