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SUMMARY:Theo Johnson-Freyd (Perimeter)
DTSTART:20221004T140000Z
DTEND:20221004T150000Z
DTSTAMP:20260423T021118Z
UID:SymSem/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SymSem/15/">
 A 4D TQFT which is not (quite) a gauge theory</a>\nby Theo Johnson-Freyd (
 Perimeter) as part of Symmetry Seminar\n\n\nAbstract\nSome people have acc
 used me of proving that every (nice enough) 4D TQFT is equivalent to a gau
 ge theory. A version of this statement is true\, but only if your notion o
 f "gauge theory" allows dynamical spin structures among the "gauge fields"
 \, and some rather complicated terms in the Lagrangian that couple the spi
 n structures to the other gauge fields. That said\, many of these 4D TQFTs
  also admit "dual" descriptions as true gauge theories for higher-form gro
 ups. In this talk\, I will explain exactly which 4D TQFTs are equivalent t
 o true (higher-group) gauge theories theories\, and present a minimal coun
 terexample to the belief that all 4D TQFTs are true gauge theories.\n
LOCATION:https://researchseminars.org/talk/SymSem/15/
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