J. Skowera's talk - change of time

[Ugo Bruzzo]

There was a mistake, sorry
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SISSA GEOMETRY SEMINAR
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Please note change of time

Dr. Jonathan Skowera (University of Zurich) 
will give a talk on

Bialiynicki-Birula decomposition of Deligne-Mumford stacks

on Wednesday 27 June at  2:30 pm in lecture room 136 (SISSA Main building, I floor)

Abstract: An action of the multiplicative group Gm can be used to 
decompose Deligne-Mumford stacks of stable maps,
thereby facilitating the computation of cohomology through the 
well-known Bialiynicki-Birula decomposition.
In particular, this process expresses the cohomology of the stack in 
terms of the cohomology of fixed point loci.
As one would hope, this property applies more broadly to any smooth, 
proper Deligne-Mumford stack over
an algebraically closed field of characteristic zero, and by an argument 
with motives, to any geometric
cohomology theory over Q. The only technical assumption is that the 
coarse moduli space of the stack be a scheme.