Spin-torsion coupling and gravitational moments of Dirac fermions: Theory and experimental bounds

We discuss the quantum dynamics of a Dirac fermion particle in the Poincare gauge gravitational field. The minimal as well as the Pauli-type nonminimal coupling of a fermion with external fields is studied, bringing into consideration the notions of the translational and the Lorentz gravitational mo...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2014-12, Vol.90 (12), Article 124068
Main Authors: Obukhov, Yuri N., Silenko, Alexander J., Teryaev, Oleg V.
Format: Article
Language:English
Subjects:
Cosmology
Fermions
Gages
Gauges
Gravitation
Gravitational fields
Joining
Transformations
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Summary:We discuss the quantum dynamics of a Dirac fermion particle in the Poincare gauge gravitational field. The minimal as well as the Pauli-type nonminimal coupling of a fermion with external fields is studied, bringing into consideration the notions of the translational and the Lorentz gravitational moments. The anomalous gravitomagnetic and gravitoelectric moments are ruled out on the basis of the covariance arguments. We derive the general Foldy-Wouthuysen transformation for an arbitrary configuration of the Poincare gauge gravitational field without assuming it is weak. Making use of the Foldy-Wouthuysen Hamiltonian for the Dirac particle coupled to a magnetic field in a noninertial reference system, we analyze the recent experimental data and obtain bounds on the spacetime torsion.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.90.124068