SMS scnews item created by Anthony Henderson at Fri 11 May 2007 1642
Type: Seminar
Distribution: World
Expiry: 18 May 2007
Calendar1: 18 May 2007 1205-1255
CalLoc1: Carslaw 375
CalTitle1: Algebra Seminar: Zhang -- Representations of orthogonal and orthosymplectic Lie algebras in the quantum Kepler problem
Auth: anthonyh@asti.maths.usyd.edu.au

Algebra Seminar

Representations of orthogonal and orthosymplectic Lie algebras in the quantum Kepler problem

Ruibin Zhang

18th May, 12:05-12:55pm, Carslaw 375


Abstract

The quantum Kepler problem is the study of a class of integrable two body quantum systems, the simplest of which is the hydrogen atom. It is shown that the system defined on RD has an so(2, D+1) dynamical symmetry, and that defined on the superspace RD|2n has a dynamical symmetry described by the orthosymplectic Lie superalgebra osp(2, D+1|2n). In each case, the negative energy eigenspaces span an infinite dimensional irreducible highest weight module for the dynamical symmetry algebra. The module is constructed explicitly, and its weight spaces are determined by studying the branching of the module with respect to so(D+1) or osp(D+1|2n). This in turn enables us to work out the spectrum of the quantum Hamiltonian, the corresponding energy eigenspaces and their dimensions. Representation theoretical solutions of generalised Kepler problems with magnetic monopole interactions will also be given.

Part of the material in this talk is based on joint work with Guowu Meng.


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