Jarod Alper: A Luna etale slice theorem for algebraic stacks
Time: Tue 2014-12-02 15.15 - 16.15
Location: Room 3418, Lindstedtsvägen 25, 4th floor, Department of mathematics, KTH
Participating: Jarod Alper, ANU and Humboldt Universität
Quotient stacks are a distinguished class of algebraic stacks which provide key intuition for studying the geometry of general algebraic stacks. It has long been believed that certain algebraic stacks are in some sense "locally" quotient stacks. In this talk, we will prove that this expectation holds by providing a description of the etale local structure of algebraic stacks near points with linearly reductive stabilizer. We will then discuss a number of striking applications of this result. This is joint work with Jack Hall and David Rydh.