arXiv math/00103082000-10-30math.QAmath.OA

A family of -algebras allowing Wick ordering: Fock representations and universal enveloping $C^$-algebras

Palle E. T. Jorgensen, Daniil P. Proskurin, Yurii Samoilenko

备注：: 9 pages, LaTeX2e document class "crckbked", NATO workshop proceedings (Kluwer) submission
发表信息：: Noncommutative Structures in Mathematics and Physics (Kiev, 2000) (S. Duplij and J. Wess, eds.), NATO Science Series II: Mathematics, Physics and Chemistry, vol. 22, Kluwer Academic Publishers, Dordrecht, 2001, pp. 321--329

英文摘要：

We consider an abstract Wick ordering as a family of relations on elements a_i and define *-algebras by these relations. The relations are given by a fixed operator T:h\otimes h --> h \otimes h, where h is one-particle space, and they naturally define both a *-algebra and an inner-product space H_T, <.,.>_T. If a_i^* denotes the adjoint, i.e., <a_iϕ,ψ>_T=<ϕ,a_i^*ψ>_T, then we identify when <.,.>_T is positive semidefinite (the positivity question). In the case of deformations of the CCR-relations (the q_{ij}-CCR and the twisted CCR's), we work out the universal C*-algebras A, and we prove that, in these cases, the Fock representations of the A's are faithful.

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