Harmonic Analysis and Fractal Geometry

Speaker: 
Sheldon Newhouse
Speaker Affiliation: 
Michigan State University

September 11, 2023

https://ubc.zoom.us/j/63696684376?pwd=Y3M1TmJLVHBBazlPNzB4clI4RGl2QT09
Vancouver, BC
Canada

This will be a joint ergodic theory and harmonic analysis and fractal geometry seminar.

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Abstract: 

The modern subject of Dynamical Systems concerns  the study of the orbit structure of Semi-Group actions on various spaces.   Until the latter part of the 19th century,  this study was primarily restricted to the kinematics of rigid motions and the dynamics of classical mechanics.   Of principal concern were problems in Celestial Mechanics.  Poincare discovered many new phenomena regarding periodic motions in the Restricted Three Body Problem--in particular  homoclinic orbits.  These are orbits which are  asymptotic to periodic orbits in forward and backward times.   They turn out to be related to newer concepts such as hyperbolicity, topological entropy,  and symbolic dynamics,  which, even recently,  give us substantial understanding of two dimensional diffeomorphisms and three dimensional flows.   We describe some historical developments leading to these advances. 

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