BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Magnus Landstad (Norwegian University of Science and Technology\, Norway) DTSTART:20221108T150000Z DTEND:20221108T160000Z DTSTAMP:20260422T181117Z UID:QGS/66 DESCRIPTION:Title: Exo tic group algebras\, crossed products\, and coactions\nby Magnus Lands tad (Norwegian University of Science and Technology\, Norway) as part of Q uantum Groups Seminar [QGS]\n\n\nAbstract\nIf $G$ is a locally compact gro up\, we have the full group C*-algebra $C^*(G)$ and the reduced $C^*_r(G)$ . We call a C*-algebra properly between $C^*(G)$ and $C^*_r(G)$ exotic.\n\ nSimilarly\, if $G$ acts on a C*-algebra $A$ we can form the full crossed product $C^*(G\\ltimes A)$ and the reduced crossed product $C^*_r(G\\ltime s A)$. An exotic crossed product is a C*-algebra properly between the two. Work by Baum\, Guentner\, and Willett show that these algebras are releva nt to the Baum-Connes conjecture.\n\nWe think that the best way to study t hese algebras is by also looking at the corresponding dual theory of coact ions. I will discuss some of these aspects\, but there will be more questi ons than answers.\n\nThis is joint work with Steve Kaliszewski and John Qu igg.\n LOCATION:https://researchseminars.org/talk/QGS/66/ END:VEVENT END:VCALENDAR