Geometrically reductive group schemes

Sean Cotner, Stanford University
IAS - Simonyi Hall Seminar Room SH-101

In SGA3, Grothendieck and Demazure developed a robust and beautiful theory of families of connected reductive groups. For many purposes (e.g., for the study of moduli spaces of Langlands parameters), it is desirable to have a theory of families of disconnected reductive groups. In this talk, I will describe some elements of such a theory and give applications.