A Group Algebra for Inductive Limit Groups. Continuity Problems of the Canonical Commutation Relations |
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Authors: | Hendrik Grundling |
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Institution: | (1) Department of Pure Mathematics, University of New South Wales, P.O. Box 1, Kensington, NSW 2033, Australia |
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Abstract: | Given an inductive limit group
where each
is locally compact, and a continuous two-cocycle
, we construct a C*-algebra
group algebra
is imbedded in its multiplier algebra
, and the representations of
are identified with the strong operator continuous
of G. If any of these representations are faithful, the above imbedding is faithful. When G is locally compact,
is precisely
, the twisted group algebra of G, and for these reasons we regard
in the general case as a twisted group algebra for G. Applying this construction to the CCR-algebra over an infinite dimensional symplectic space (S,\,B),we realise the regular representations as the representation space of the C*-algebra
, and show that pointwise continuous symplectic group actions on (S,\, B) produce pointwise continuous actions on
, though not on the CCR-algebra. We also develop the theory to accommodate and classify 'partially regular' representations, i.e. representations which are strong operator continuous on some subgroup H of G (of suitable type) but not necessarily on G, given that such representations occur in constrained quantum systems. |
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Keywords: | twisted group algebra inductive limit group discontinuous group representation CCR-algebra symplectic action quantum field |
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