Diffeomorphisms of unit circle, shape analysis and some non-linear PDEs

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• Irina Markina (Universitetet i Bergen)
• Thursday 10 October 2019, 16:00-17:00
• Seminar Room 2, Newton Institute.

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CAT - Complex analysis: techniques, applications and computations

In the talk, we explain how univalent functions can be used to 
analyze plain shapes. In its turn, the univalent functions defined on 
the unit disc are closely related to the group of oriented preserving 
diffeomorphisms of the unit circle. A moving plain shape gives rise to a 
curve on the group of diffeomorphisms. The requirement to describe a 
shape modulo its rotation and/or scaling leads to a curve subordinated 
to some constraints. A geodesic curve of the motion of a shape is a 
solution to some non-linear partial differential equation. The choice of 
metric leads to different PDEs, that are generalizations of equations 
originated in fluid dynamics, such us inviscid Burgers' equation, 
Camassa-Holm, Hunter-Saxton, and KdV.

This talk is part of the Isaac Newton Institute Seminar Series series.

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