Parahoric subgroups and supercuspidal representations of $p$-adic groups

Parahoric subgroups and supercuspidal representations of $p$-adic groups

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Benedict Gross, Harvard University
IAS Room S-101

This is a report on some joint work with Mark Reeder and Jiu-Kang Yu. I will review the theory of parahoric subgroups and consider the induced representation of a one-dimensional character of the pro-unipotent radical. A surprising fact is that this induced representation can (in certain situations) have finite length. I will describe the parahorics and characters for which this occurs, and what the Langlands parameters of the corresponding irreducible summands must be.