Anna Duwenig (Leuven): Cartan subalgebras for non-principal twisted groupoid C*-algebras. Oberseminar C*-Algebren.
Tuesday, 11.04.2023 16:15 im Raum SRZ 216/217
The reduced C*-algebra of a topologically principal twisted groupoid has a canonical Cartan subalgebra: functions on its unit space. A remarkable Weyl groupoid construction, due to Kumjian and Renault, asserts the converse: If a C*-algebra A admits a Cartan subalgebra, there exists such a groupoid whose C*-algebra is isomorphic to A in a Cartan-preserving way. In this talk, I will present on joint work with Gillaspy, Norton, Reznikoff, and Wright, in which we identified subgroupoids of (not necessarily topologically principal) groupoids that give rise to Cartan subalgebras. I will then give an explicit description of the associated Weyl groupoid and twist, which is based on further joint work with Gillaspy and Norton.
Angelegt am Thursday, 12.01.2023 11:45 von elke
Geändert am Friday, 31.03.2023 09:26 von elke
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