Igor Rapinchuk
Michigan State University
Title
Groups with good reduction, buildings, and the genus problem
Abstract
Over the last few years, the analysis of algebraic groups with good reduction has come to the forefront in the emerging arithmetic theory of algebraic groups over higher-dimensional fields. Current efforts are focused on finiteness conjectures for forms of reductive algebraic groups with good reduction that share some similarities with the famous Shafarevich Conjecture in the study of abelian varieties. Most results on these conjectures obtained so far have ultimately relied on finiteness properties of appropriate unramified cohomology groups. However, quite recently, methods based on building-theoretic techniques have emerged as a promising alternative approach. I will showcase some of these developments by sketching a new proof of a theorem of Raghunathan-Ramanathan concerning torsors over the affine line. Time-permitting, I will also discuss some connections to the genus problem, which deals with simple algebraic groups having the same isomorphism classes of maximal tori.
Zoom Link: https://osu.zoom.us/j/95399271001?pwd=eC3UNVVuvppO7vbul5h8vMSU5MsJMx.1
For More Information About the Seminar
Contact for the Seminar: Connor Cassady, cassady.82@osu.edu
