## PIMS Applied Mathematics Seminar Series: Ken McLaughlin

• Date: 03/09/2012
• Time: 15:30
Lecturer(s):
Ken McLaughlin
Location:

Topic:

Oscillatory phenomenon in a scaling limit for the periodic linear Schrödinger equation

Description:

Abstract:

In the 1830s Henry Fox Talbot discovered a self-imaging phenomenon in coherent illumination of a periodic diffraction grating. Since then, studies of the Talbot effect (as it is called) have themselves recurred frequently. One such incarnation was initiated by Michael Berry; eventually some interesting fractal dimension results were proven by subsequent researchers. I will explain some of these connections, and some recent developments concerning oscillatory phenomena reminiscent of Gibbs’ phenomenon. In passing I will explain some possible misconceptions concerning the discovery of Gibbs’ phenomenon. Themain mathematical connection is that the Fourier series solution is quite directly related to exponential sums appearing in classical analytic number theory.

Other Information:

Location: Arts 263