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TZID:Europe/Vienna
BEGIN:DAYLIGHT
DTSTART:20260329T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
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DTSTART:20261025T020000
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BEGIN:VEVENT
DTSTAMP:20260415T142630Z
UID:1776338100@ist.ac.at
DTSTART:20260416T131500
DTEND:20260416T150000
DESCRIPTION:Speaker: Isabella Khan\nhosted by Xujia Chen\nAbstract: The Hee
 gaard Floer d-invariant is a numerical invariant of rational homology sphe
 res which is analogous to the Frøyshov h-invariant from Instanton theory.
  In this talk\, we use Zemke’s recent isomorphism between lattice Floer 
 and Heegaard Floer homology to compute the d-invariant for all rational ho
 mology spheres which arise as negative definite plumbed manifolds\, verify
 ing a 20 year old conjecture of Némethi. 
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:Stephanie.Dolot@ist.ac.at
SUMMARY:Isabella Khan: The Heegaard Floer d-invariant for rational homology
  spheres
URL:https://talks-calendar.ista.ac.at/events/6403
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260415T142630Z
UID:665dbdca9443e835749719@ist.ac.at
DTSTART:20260423T131500
DTEND:20260423T151500
DESCRIPTION:Speaker: David Hernandez\nhosted by Xujia Chen & Tamas Hausel\n
 Abstract: Shifted quantum groups emerged from the study of quantized Coulo
 mb branches (which are symplectic duals to quiver varieties). We show that
  the Grothendieck ring of the category O for the shifted quantum affine al
 gebras has the structure of a cluster algebra (jt work with Geiss and Lecl
 erc). This has several applications\, such as geometric character formulas
  for simple classes corresponding to cluster variables.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:boosthui@ist.ac.at
SUMMARY:David Hernandez: Shifted quantum groups\, cluster algebras and geom
 etric character formulas
URL:https://talks-calendar.ista.ac.at/events/6363
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260415T142630Z
UID:684800150f201048290295@ist.ac.at
DTSTART:20260506T153000
DTEND:20260506T163000
DESCRIPTION:Speaker: Hong Wang\nhosted by Laszlo Erdös & Uli Wagner\nAbstr
 act: A Kakeya set is a compact subset of R^n that contains a unit line seg
 ment pointing in every direction. Kakeya set conjecture asserts that every
  Kakeya set has Minkowski and Hausdorff dimension n. We prove this conject
 ure in R^3 as a consequence of a more general statement about union of tub
 es.This is joint work with Josh Zahl.
LOCATION:Raiffeisen Lecture Hall\, Central Building\, ISTA
ORGANIZER:boosthui@ist.ac.at
SUMMARY:Hong Wang: Kakeya sets in R^3
URL:https://talks-calendar.ista.ac.at/events/6400
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260415T142630Z
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
END:VEVENT
END:VCALENDAR