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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:5
UID:UW-Physics-Event-9254
DTSTART:20250822T203000Z
DTEND:20250822T220000Z
DTSTAMP:20260413T102700Z
LAST-MODIFIED:20250822T221738Z
LOCATION:Chamberlin 5280
SUMMARY:Symmetry enhancements in Maxwell theory on four-manifolds\, Th
 eory Seminar (High Energy/Cosmology)\, Raffaele Savelli\, University o
 f Rome "Tor Vergata"
DESCRIPTION:Despite the absence of local interactions\, Maxwell theory
  on topologically non-trivial four-manifolds has interesting features.
  Due to the well-known tension between electromagnetic duality and the
  gravitational background\, global symmetries arising at self-dual poi
 nts may be plagued by ’t Hooft anomalies\, causing the partition fun
 ction to vanish. I will show that\, when the geometry allows for a hol
 omorphic factorization of the partition function\, new discrete symmet
 ries emerge\, not inherited from dualities\, whose anomalies explain w
 hy the partition function can be zero even when ordinary duality-symme
 tries are anomaly free. I will finally discuss the non-invertible gene
 ralization of such symmetries and argue that their anomalies can accou
 nt for a vanishing partition function at non self-dual points. Event r
 ecording: https://youtu.be/wdPyuapS50s
URL:https://www.physics.wisc.edu/events/?id=9254
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