International Journal of Theoretical Physics

, Volume 52, Issue 11, pp 4032–4044 | Cite as

On the Non-uniqueness Problem of the Covariant Dirac Theory and the Spin-Rotation Coupling



Gorbatenko and Neznamov [arXiv:1301.7599, 2013] recently claimed the absence of the title problem. In this paper, the reason for that problem is reexplained by using the notions of a unitary transformation and of the mean value of an operator, invoked by them. Their arguments actually aim at proving the uniqueness of a particular prescription for solving this problem. But that prescription is again shown non-unique. Two Hamiltonians in the same reference frame in a Minkowski spacetime, only one of them including the spin-rotation coupling term, are proved to be physically non-equivalent. This confirms that the reality of that coupling should be checked experimentally.


Dirac Hamiltonian Curved spacetime Unitary transformation Rotating frame 



It was noted by M. V. Gorbatenko & V. P. Neznamov (private communication) and by a referee that, in the first version of this paper, it was not accounted for the fact that the energy can usually be subjected to a constant shift. The referee suggested a definition of physically equivalent energy operators which is equivalent to the one given below.


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© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Laboratory “Soils, Solids, Structures, Risks”, 3SRCNRS and Universités de Grenoble: UJF, Grenoble-INPGrenoble Cedex 9France

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