Group Theoretical Examination of the Relativistic Wave Equations on Curved Spaces . II . Real Spaces

The group theoretical approach to relativistic wave equations for spin 0,1/2 and 1 massless particles in the real reducible spaces and in the de Sitter and Anti-de Sitter spaces for spin 0 and 1/2 massive particles are considered. The invariant wave equations which determines the appropriate irreducible representations are constructed. The explicit solutions of these equations possessing a simplicity and physical transparency are obtained without use of the separation of variables method. The connection with the tetrad approach to wave equations in a curved space is established. It is shown that the Anti-de Sitter space is the solution of the Einstein-Dirac equations. The geometrical meaning of the mass quantization in the Anti-de Sitter space and of the particle creation in de Sitter space is shown.