String Operations for Orbifolds

Behrang Noohi (Queen Mary University of London)

Monday 25th November, 2013 16:00-17:00 Maths 204


I begin with a gentle introduction to Goldman bracket and 
Turaev cobracket on loops on a surface. Then try to generalise these 
to loops on orbifolds via some simple examples and observe the special
role played by the inertia groups. I then cast the theory in the stack 
language and propose a general framework for string operations on 
differentiable stacks. 

I'll avoid the technicalities of stacks, so the talk should be accessible 
even if you do not know what a stack is.

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