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Unbounded derivations commuting with compact group actions
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Unbounded derivations commuting with compact group actions

F Goodman and P. E. T Jørgensen
Communications in mathematical physics, Vol.82(no. 3), pp.399-405
1981
DOI: 10.1007/BF01237047

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Abstract

Let δ be a closed * derivation in a C* algebra {Mathematical expression} which commutes with an ergodic action of a compact group on {Mathematical expression}. Then δ generates a C* dynamics of {Mathematical expression}. Similar results are obtained for non-ergodic actions on abelian C* algebras and on the algebra of compact operators. © 1981 Springer-Verlag.
22D99 46L55

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