β Scribed by K Baumann; G Eder; R Sexl; W Thirring
No coin nor oath required. For personal study only.
A model field theory of the superconducting type is solved exactly. The exact solution is compared with the Bardeen-Cooper-schrieffer solution. The exact ground state is nondegenerate while the Bardeen-Cooper-fohriefter ground state is degenerate. The connection between the two types of ground states, and hetween their energies, is given. Also some properties of the excited states are discussed.
π SIMILAR VOLUMES
We consider M(v):, models of Euclidean quantum field theory, P(v) = X',t, akyk and define for them translation-invariant ground states. It appears that the number of them is not more than two provided Xim,2 is large. ## 1. PHASE DIAGRAMS AND GROUND STATES FOR CLASSICAL LATTICE SPIN SYSTEMS Let us
## Abstract The quasiβdegenerate perturbation theory (QDPT) with complete active space (CAS) selfβconsistent field (SCF) reference functions is extended to the general multiconfiguration (MC) SCF references functions case. A computational scheme that utilizes both diagrammatic and sumβoverβstates a