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Philadelphia Area Number Theory Seminar

Wednesday, March 28, 2018 - 2:15pm

Peter Humphries

University College London


Bryn Mawr College

Park Science Building, Room 328

Talk is scheduled to begin at 2:40 PM. Tea and refreshments will be served at 2:20 PM in Park Science Building, Room 339.

I will discuss the problem of small scale equidistribution of Hecke–Maass eigenforms, namely the problem of the rate at which hyperbolic balls can shrink as the Laplacian eigenvalue tends to infinity for which the Laplacian eigenfunctions still equidistribute on these balls. There is a natural barrier — the Planck scale —for which equidistribution fails, but conditionally equidistribution occurs in almost every shrinking ball at every larger scale. I will also discuss related small scale equidistribution problems for geometric invariants associated to quadratic fields.