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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Positivity and purity in DT theory
DTSTART:20130114T140000
DTEND:20130114T160000
DTSTAMP:20260926T140133Z
UID:1a3f1ea0ae9058a007bdba4555e678d05b00c7d62906a2ea5145805f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Ben Davison\,  IMJ\, Paris\nIn the first half of this talk I 
 will give an introduction to motivic/refined Donaldson-Thomas theory\, and
  explain the role of vanishing cycles in it\, focusing on a few specific e
 xamples arising from local Calabi-Yau resolutions of singularities.  I wi
 ll then present recent joint work with Maulik\, Schürmann and Szendroi on
  the purity of such vanishing cycles for graded potentials\, and briefly d
 iscuss the applications of this work in the theory of quantum cluster alge
 bras\, specifically in attacking the positivity conjecture of Fomin and Ze
 levinsky.  Finally I will explain the link between graded potentials in D
 onaldson-Thomas theory and the study of character varieties of Reimann sur
 faces.
LOCATION:CM1104 http://plan.epfl.ch/?lang=fr&room=CM1104
STATUS:CONFIRMED
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