String topology for stacks --
Behrang Noohi

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Tuesday, March 11, 2008<br>
528 Mathematics Hall

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For a certain class of topological stacks (including quotient
stacks
of smooth compact Lie group actions on manifolds) we show the existence
of the string product on the homology of the loop stack. The main technical
tool is Fulton-MacPherson's bivariant theory. This is a joint work with
K. Behrend,  G. Ginot, and P. Xu.