TY  - JOUR
A1  - Elze, Hans-Thomas
A1  - Greiner, Walter
T1  - Quantum statistics with internal symmetry
T2  - Physical review A
N2  - We formulate a group-theoretical projection technique for the quantum-statistical description of systems with exactly conserved charges corresponding to local non-Abelian gauge symmetries. The formalism is specified for SU(N) internal symmetry and a partition function related to a mixed canonical–grand-canonical ensemble is defined. Its perturbation expansion is derived, and we point out potential applications. We also study single-particle Green’s functions for the calculation of mixed ensemble averages with the help of a generalized Wick’s theorem and find that a connected-graphs expansion is impossible.
Y1  - 2006
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2449
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-29486
UR  - http://link.aps.org/abstract/PRA/v33/p1879
VL  - 33
IS  - 3
SP  - 1879
EP  - 1891
ER  -