Geometry working seminar

Tuesday, July 29, 2014 9:30 AM EDT

Talk 1. Krishan Rajaratnam, Pure Mathematics Department, University of Waterloo

“Orthogonal separation of the Hamilton-Jacobi equation on spaces of constant curvature”

What is in common between the Kepler problem, a hydrogen atom, and a rotating black- hole? These systems are described by different physical theories, but much information about them can be obtained by separating an appropriate Hamilton-Jacobi equation. The separation of variables of the Hamilton-Jacobi equation is an old but still powerful tool for obtaining exact solutions. In this presentation we will give an overview of the recently constructed geometric theory of orthogonal separable coordinates for the Hamilton-Jacobi equation on spaces of constant curvature. These coordinates are of interest in mathematical physics because they also allow for the separation of the Helmholtz equation in Euclidean space and the Klein- Gordon equation in Minkowski space. The theory revolves around a certain type of conformal Killing tensor called a concircular tensor. Our first main result shows how to use these tensors to construct a special class of separable coordinates (called Kalnins-Eisenhart-Miller (KEM) coordinates) on a given space. Conversely, the second result generalizes the Kalnins-Miller classification to show that any orthogonal separable coordinates in a space of constant cur- vature are KEM coordinates. A closely related recursive algorithm is defined which allows one to intrinsically (coordinate independently) search for KEM coordinates which separate a given (natural) Hamilton-Jacobi equation. This algorithm is exhaustive in spaces of constant curvature. We will expose this theory by applying it to prove separability of well known co- ordinate systems in Euclidean 3-space, and then to study the separability properties of the Calogero-Moser system.

Talk 2. Spiro Karigiannis, Pure Mathematics Department, University of Waterloo

“Something about total spaces of vector bundles”

I’m thinking about putting Riemannian metrics on total spaces of vector bundles that come equipped with fibre metrics, base metrics, and a connection. From there we want to understand the curvature. This will be very informal.

Location

MC - Mathematics & Computer Building

5046
200 University Avenue West
Waterloo, ON N2L 3G1
Canada