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SUMMARY:Nathan Seiberg (Institute for Advanced Study)
DTSTART:20230911T190000Z
DTEND:20230911T200000Z
DTSTAMP:20260423T021404Z
UID:WHCGP/54
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/WHCGP/54/">E
 manant Symmetries</a>\nby Nathan Seiberg (Institute for Advanced Study) as
  part of Western Hemisphere colloquium on geometry and physics\n\n\nAbstra
 ct\nBased on joint work with Meng Cheng (arXiv:2211.12543)\, with Shu-Heng
  Shao (arXiv: 2307.02534)\, and with Shu- Heng Shao and Sahand Seifnashri 
 (to appear)\, we will discuss some aspects of global symmetries and their 
 ‘t Hooft anomalies. We will define a notion of an emanant global symmetr
 y. It is not a symmetry of the UV theory\, but unlike emergent (accidental
 ) symmetries\, it is not violated by any relevant or irrelevant operators 
 in the IR theory. It is an exact symmetry of the low-energy theory. We wil
 l demonstrate this notion in several well-known examples. We will discuss 
 in detail the Majorana chain\, the transverse field Ising model\, a contin
 uum system with a chemical potential\, and the Heisenberg chain. In all th
 ese models\, we will find emanant symmetries. In one case\, it is a non-in
 vertible emanant symmetry.\n
LOCATION:https://researchseminars.org/talk/WHCGP/54/
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