Geometrization of covering groups
Speaker: Yifei Zhao
Time: 15:45-17:15 11 September 2025
Venue: Room 507, A6, Institute of Mathematics
Online (Zoom meeting): https://us06web.zoom.us/j/88177098362?pwd=qPMMbcRjMYoR321S7oqW3MUbZHKFGa.1
Meeting ID: 881 7709 8362
Passcode: 123456
Abstract: Reductive groups over local fields admit (typically non-algebraic) topological covers, called "covering groups". An old idea of Deligne is that they arise as transgressions of degree-4 étale cohomology classes of the classifying stack. In this talk, I will explain how this old idea can be combined with new methods in arithmetic geometry to make advances in the Langlands program for covering groups.
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