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SUMMARY:Thomas Dumitrescu (UCLA)
DTSTART:20201102T193000Z
DTEND:20201102T203000Z
DTSTAMP:20260423T023055Z
UID:PUHET/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/PUHET/6/">2-
 Group Symmetries in Six Dimensions</a>\nby Thomas Dumitrescu (UCLA) as par
 t of Princeton HET seminar\n\n\nAbstract\nI will review the notion of (con
 tinuous) 2-group global symmetries\, which mix ordinary and higher-form gl
 obal symmetries\, and explain why they naturally arise in many 6d gauge th
 eories. Most 6d SCFTs and little string theories have weakly-coupled infra
 red phases with gauge fields. While non-trivial 2-group symmetries are oft
 en present in little string theories\, I will explain why they can never a
 rise in unitary SCFTs. This observation can be used to establish a previou
 sly conjectured algorithm for computing ’t Hooft anomalies of such SCFTs
 . Finally\, I will use this understanding to shed light on the a-theorem i
 n six dimensions. In particular I will show that all unitary 6d SCFTs have
  positive a-anomaly.\n
LOCATION:https://researchseminars.org/talk/PUHET/6/
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