Nonrelativistic approximation for quasi-planes waves of a spin 1   particle in Lobachevsky space
  Spin 1 particle in Pauli approximation is investigated on the background of the curved space of constant negative curvature, Lobachevsky space. Nonrelativistic approximation is performed in the system of 10 equations resulted from separating the variables in Duffin-Kemmer equation specified in quasi-cartesian coordinates. The problem is solved exactly in Bessel functions, the quantum states are determined by four quantum numbers. The treatment is substantially based on the use of a generalized helicity operator in Lobachevsky space model. 
E. M. Ovsiyuk, K. V. Kazmerchuk
math-ph math.MP