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SUMMARY:Hypergroup orbifolds of vertex operator algebras - Terry Gannon (U
 niversity of Alberta)
DTSTART:20230630T123000Z
DTEND:20230630T133000Z
UID:TALK202027@talks.cam.ac.uk
DESCRIPTION:We have an effective theory for understanding how to extend a 
 chiral conformal field theory -- e.g. it has been applied recently to clas
 sify all extensions of the chiral theories associated to affine Lie algebr
 as. But going in the other direction\, from the bigger theory to a smaller
  one\, is a different story. The main method we have is looking at fixed p
 oints of a subgroup of automorphisms\, but this is far from complete. Bisc
 hoff explained recently the general situation for conformal nets: the smal
 ler theory is fixed points by a hypergroup acting on the bigger theory. Hi
 s argument is not at all effective\, and it isn't clear how it looks for v
 ertex operator algebras. I will try to address hoth in my talk. This is jo
 int work with my grad student\, Andrew Riesen.
LOCATION:Seminar Room 1\, Newton Institute
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