# The Runge-Lenz vector for quantum Kepler problem in the space of positive constant curvature and complex parabolic coordinates

Research paper by A. A. Bogush, V. S. Otchik, V. M. Red'kov

Indexed on: 17 Dec '06Published on: 17 Dec '06Published in: High Energy Physics - Theory

#### Abstract

By analogy with the Lobachevsky space H_{3}, generalized parabolic coordinates (t_{1},t_{2},\phi) are introduced in Riemannian space model of positive constant curvature S_{3}. In this case parabolic coordinates turn out to be complex valued and obey additional restrictions involving the complex conjugation. In that complex coordinate system, the quantum-mechanical Coulomb problem is stu- died: separation of variables is carried out and the wave solutions in terms of hypergeometric functions are obtained. At separating the variables, two parameters k_{1} and k_{2} are introduced, and an operator B with the eigen values (k_{1}+k_{2}) is found, which is related to third component of the known Runge-Lenz vector in space S_{3} as follows: i B = A _{3} + i \vec{L}^{2}, whereas in the Lobachevsky space as B =A_{3} + \vec{L}^{2}. General aspects of the possibility to employ complex coordinate systems in the real space model S_{3} are discussed.