# Bounding Sup-Norms of Cusp Forms

 JOINT IAS/PU NUMBER THEORY SEMINAR Topic: Bounding Sup-Norms of Cusp Forms Speaker: V. Blomer Affiliation: University of Toronto Date: Thursday, February 26 Time/Room: 4:30pm - 5:30pm/West Bldg. Lecture Hall

Given an L^2-normalized cusp form f on a modular curve X_0(N) , what can be said about pointwise bounds for f ? For Hecke eigenforms, we will prove the first non-trivial bound in terms of the level N as well as hybrid bounds in terms of the level and the Laplacian eigenvalue. Similar techniques work for functions on other spaces, e.g. quotients of quaternion algebras. This is joint work with R. Holowinsky.