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SUMMARY:Monodromy\, flops and deformations - Michael Wemyss\, Glasgow
DTSTART:20171108T160000Z
DTEND:20171108T170000Z
UID:TALK74211@talks.cam.ac.uk
CONTACT:Ivan Smith
DESCRIPTION:The aim of the talk is to explain how the topology of (simplic
 ial) hyperplane arrangements\, through the work of Deligne\, enshrines var
 ious derived categories in algebraic geometry with an action of the associ
 ated fundamental group.  This group action encodes\, roughly\, the "birati
 onal geometry" piece of the derived category.  The equivalences correspond
 ing to monodromy in this action arise from objects which are not strictly 
 spherical\, but are after (noncommutative) deformation. Towards the end of
  the talk I will explain a technique that shows that the action is faithfu
 l.  Parts are joint with Will Donovan\, and parts with Yuki Hirano.
LOCATION:MR13
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