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TZID:Europe/Vienna
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DTSTART:20260329T030000
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DTSTAMP:20260513T171454Z
UID:665dbdca98c2b709685894@ist.ac.at
DTSTART:20260521T131500
DTEND:20260521T151500
DESCRIPTION:Speaker: Pieter Belmans\nhosted by Tamas Hausel\nAbstract: The 
 classification of Fano 4-folds is still largely open. Whilst moduli of sta
 ble quiver representations are varieties with very special properties\, it
  turns out that subspace quivers give rise to four interesting Fano 4-fold
 s (2 of which appear to be new) which are rigid\, have no vector fields\, 
 have high Picard rank\, and have an interesting structure from an MMP pers
 pective. The tools for studying moduli of quiver representations work part
 icularly well for these examples\, and I will describe their intricate geo
 metry. This is joint work with Markus Reineke.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:boosthui@ist.ac.at
SUMMARY:Pieter Belmans: Fano 4-folds from subspace quiver moduli
URL:https://talks-calendar.ista.ac.at/events/6439
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260513T171454Z
UID:665dbdca9d01d401146589@ist.ac.at
DTSTART:20260618T130000
DTEND:20260618T150000
DESCRIPTION:Speaker: Jianrong Li\nhosted by Tamas Hausel\nAbstract: Frenkel
  and Reshetikhin introduced q-characters for finite-dimensional representa
 tions of quantum affine algebras\, providing a fundamental tool in their r
 epresentation theory. Together with Tomasz Przezdziecki\, we defined bound
 ary q-characters for finite dimensional representations of quantum affine 
 symmetric pairs of split and quasi-split types. In this talk\, I will pres
 ent a new joint work Tomasz Przezdziecki on evaluation modules for split q
 uantum affine symmetric pairs. By computing the action of generators in Lu
  and Wangs Drinfeld-type presentation on GelfandTsetlin bases\, we determi
 ne the spectrum of a large commutative subalgebra arising from this presen
 tation. This leads to an explicit formula for boundary analogues of q-char
 acters\, which we interpret combinatorially in terms of semistandard Young
  tableaux. Our results show that boundary q-characters share familiar feat
 ures with ordinary q-characters\, while also exhibiting new phenomena\, in
 cluding an additional symmetry.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:boosthui@ist.ac.at
SUMMARY:Jianrong Li: Boundary q-characters of finite-dimensional representa
 tions of quantum affine symmetric pairs
URL:https://talks-calendar.ista.ac.at/events/6284
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