Some remarks on the GNS representations of topological $^*$-algebras

Details Some remarks on the GNS representations of topological $^*$-algebras Some remarks on the GNS representations of topological $^*$-algebras

2007-11-20

arxiv.org/abs/0711.3056v2

J. Math. Phys. 49, 033510 (2008)

Physics

Mathematical Physics

34 pages. Minor changes. To appear in J. Math. Phys. 49 (4) Apr-08

Scientific paper

10.1063/1.2897032

After an appropriate restatement of the GNS construction for topological $^*$-algebras we prove that there exists an isomorphism among the set $\cycl(A)$ of weakly continuous strongly cyclic $^*$-representations of a barreled dual-separable $^*$-algebra with unit $A$, the space $\hilb_A(A^*)$ of the Hilbert spaces that are continuously embedded in $A^*$ and are $^*$-invariant under the dual left regular action of $A$ and the set of the corresponding reproducing kernels. We show that these isomorphisms are cone morphisms and we prove many interesting results that follow from this fact. We discuss how these results can be used to describe cyclic representations on more general inner product spaces.

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