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SUMMARY:Severin Bunk (Univ. Hamburg)
DTSTART:20210129T170000Z
DTEND:20210129T180000Z
DTSTAMP:20260423T024653Z
UID:TQFT/25
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TQFT/25/">Un
 iversal Symmetries of Gerbes and Smooth Higher Group Extensions</a>\nby Se
 verin Bunk (Univ. Hamburg) as part of Topological Quantum Field Theory Clu
 b (IST\, Lisbon)\n\n\nAbstract\nGerbes are geometric objects describing th
 e third integer cohomology group of a manifold and the B-field in string t
 heory\; they can essentially be understood as bundles of categories whose 
 fibre is equivalent to the category of vector spaces. Starting from a hand
 s-on example\, I will explain gerbes and their categorical features. The m
 ain topic of this talk will then be the study of symmetries of gerbes in a
  universal manner. We will see that these symmetries are completely encode
 d in an extension of smooth 2-groups. In the last part\, I will survey how
  this construction can be used to provide a new smooth model for the strin
 g group\, via a theory of group extensions in $\\infty$-topoi.\n
LOCATION:https://researchseminars.org/talk/TQFT/25/
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