Geodesic
Equations of motion for scalar and spinor fields in a~four-dimensional non-euclidean momentum space
Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 3, pp. 363-372

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Equations of motion are obtained for a scalar and a spinor field in a four-dimensional non-Euclidean momentum space. They contain as a parameter a fundamental length $l$ and go over into the ordinary Klein–Gordon and Dirac equations in the limit $l\to0$. In the new formalism, an important part is played by the concept of a “vacuum momentum”, which is due to I. E. Tamm. The obtained equations remain invariant under spatial reflection only when the vacuum momentum is simultaneously transformed. 
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     author = {I. P. Volobuev and V. G. Kadyshevskii and M. D. Mateev and R. M. Mir-Kassimov},
     title = {Equations of motion for scalar and spinor fields in a~four-dimensional non-euclidean momentum space},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_40_3_a5/}
}
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I. P. Volobuev; V. G. Kadyshevskii; M. D. Mateev; R. M. Mir-Kassimov. Equations of motion for scalar and spinor fields in a~four-dimensional non-euclidean momentum space. Teoretičeskaâ i matematičeskaâ fizika, Tome 40 (1979) no. 3, pp. 363-372. http://geodesic.mathdoc.fr/item/TMF_1979_40_3_a5/