The results of a study of the Dirac Hamiltonian for a point electron in the zero-gravity Kerr-Newman spacetime are reported; here, "zero-gravity" means G → 0, where G is Newton's constant of universal gravitation, and the limit is effected in the Boyer-Lindquist coordinate chart of the maximal analytically extended, topologically nontrivial, Kerr-Newman spacetime. In a nutshell, the results are: the essential self-adjointness of the Dirac Hamiltonian; the reflection symmetry about zero of its spectrum; the location of the essential spectrum, exhibiting a gap about zero; and (under two smallness assumptions on some parameters) the existence of a point spectrum in this gap, corresponding to bound states of Dirac's point electron in the electromagnetic field of the zero-G Kerr- Newman ring singularity. The symmetry result of the spectrum extends to the Dirac Hamiltonian for a point electron in a generalization of the zero-G Kerr- Newman spacetime with different ratio of electric-monopole to magnetic-dipole moment. The results are discussed in the context of the general-relativistic hydrogen problem. Also, some interesting projects for further inquiry are listed in the last section.
CITATION STYLE
Kiessling, M. K. H., & Tahvildar-Zadeh, A. S. (2016). Dirac’s point electron in the zero-gravity Kerr-Newman world. In Quantum Mathematical Physics: A Bridge between Mathematics and Physics (pp. 441–469). Springer International Publishing. https://doi.org/10.1007/978-3-319-26902-3_19
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