Graded extension of SO(2,1) Lie algebra and the search for exact solutions of Dirac equation by point canonical transformations

Details Graded extension of SO(2,1) Lie algebra and the search for exact solutions of Dirac equation by point canonical transformations Graded extension of SO(2,1) Lie algebra and the search for exact solutions of Dirac equation by point canonical transformations

2001-12-04

arxiv.org/abs/math-ph/0112004v2

Phys. Rev. A 65, 042109 (2002); Erratum: 66, 019902 (2002)

Physics

Mathematical Physics

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Scientific paper

10.1103/PhysRevA.65.042109

SO(2,1) is the symmetry algebra for a class of three-parameter problems that includes the oscillator, Coulomb and Morse potentials as well as other problems at zero energy. All of the potentials in this class can be mapped into the oscillator potential by point canonical transformations. We call this class the "oscillator class". A nontrivial graded extension of SO(2,1) is defined and its realization by two-dimensional matrices of differential operators acting in spinor space is given. It turns out that this graded algebra is the supersymmetry algebra for a class of relativistic potentials that includes the Dirac-Oscillator, Dirac-Coulomb and Dirac-Morse potentials. This class is, in fact, the relativistic extension of the oscillator class. A new point canonical transformation, which is compatible with the relativistic problem, is formulated. It maps all of these relativistic potentials into the Dirac-Oscillator potential.

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