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SUMMARY:Ana Balibanu (Harvard)
DTSTART:20220304T200000Z
DTEND:20220304T210000Z
DTSTAMP:20260407T214323Z
UID:agstanford/79
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/agstanford/7
 9/">Regular centralizers and the wonderful compactification</a>\nby Ana Ba
 libanu (Harvard) as part of Stanford algebraic geometry seminar\n\n\nAbstr
 act\nThe universal centralizer of a complex semisimple adjoint group G is 
 the family of regular centralizers in G\, parametrized by the regular conj
 ugacy classes. It has a natural symplectic structure which is inherited fr
 om the cotangent bundle of G. I will construct a smooth\, log-symplectic r
 elative compactification of this family using the wonderful compactificati
 on of G. Its compactified centralizer fibers are isomorphic to Hessenberg 
 varieties\, and its symplectic leaves are indexed by root system combinato
 rics. I will also explain how to produce a multiplicative analogue of this
  construction\, by moving from the Poisson to the quasi-Poisson setting.\n
 \nThe synchronous discussion for Ana Balibanu’s talk is taking place not
  in zoom-chat\, but at https://tinyurl.com/2022-03-04-ab (and will be dele
 ted after ~3-7 days).\n
LOCATION:https://researchseminars.org/talk/agstanford/79/
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