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SUMMARY:Urs Schreiber (NYU Abu Dhabi)
DTSTART:20250326T150000Z
DTEND:20250326T163000Z
DTSTAMP:20260422T174422Z
UID:tandg/27
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/tandg/27/">N
 on-Lagrangian construction of abelian CS/FQH-theory via flux quantization 
 in 2-Cohomotopy</a>\nby Urs Schreiber (NYU Abu Dhabi) as part of Topology 
 and Geometry Seminar (Texas\, Kansas)\n\n\nAbstract\nAfter briefly recalli
 ng how the analog of Dirac charge quantization in exotic (effective\, high
 er) gauge theories\, providing their global topological completion\, is en
 coded in a choice of classifying space $𝒜$ whose rationalization reflec
 ts the flux Bianchi identities\, I explain how the choice $𝒜 ≔ S^2$ (
 “flux quantization in 2-Cohomotopy”) implements effective corrections 
 to ordinary Dirac flux quantization\, which over surfaces yields exactly t
 he topological quantum observables of fractional quantum Hall systems\, tr
 aditionally described by abelian Chern-Simons theory. I close by briefly i
 ndicating how this situation is geometrically engineered on probe M5-brane
 s if the M-theory C-field is flux-quantized in 4-Cohomotopy (“Hypothesis
  H”).\nThis is joint work with Hisham Sati\; for more pointers see <a hr
 ef="https://ncatlab.org/schreiber/show/ISQS25">ncatlab.org/schreiber/show/
 ISQS25</a>.\n
LOCATION:https://researchseminars.org/talk/tandg/27/
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