Summary
The Dirac equation—with a Pauli term—is transformed to a covariant and Hermitian two-component form to first order inħ. The Bargmann-Michel-Telegdi equations are deduced as equations of motion for spin operators. Corresponding operators in the Dirac and the semi-classical picture are discussed.
Riassunto
Si trasforma l’equazione di Dirac — con un termine di Pauli — in una forma covariante e hermitiana a due componenti, del primo ordine inħ. Si deducono le equazioni di Bargmann-Michel-Teledgi come equazioni di moto degli operatori di spin. Si discutono i corrispondenti operatori nella rappresentazione di Dirac ed in quella semiclassica.
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Literatur
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A transformation of Dirac’s equations to a relativistic—but noncovariant—and Hermitian two-component form to first order inħ was made by the author inPhysica Norvegica,1, 27 (1962).
See also:A. Chakrabarti:Journ. Math. Phys.,4, 1215, 1223 (1963);5, 922, 1747 (1964).
M. Kolsrud:Phys. Math. Univ. Oslo (1965).
Stepwise transformations of similar kind were used for relativistic Foldy-Wouthuysen-like transformations byE. Eriksen andM. Kolsrud:Suppl. Nuovo Cimento,18, 1 (1960). See also ref. (6). If negative energies were used (u 0=−√u 2 + 1), thenɛ → −β, requiring anotherΛ 0. SeeE. Plahte: to be published.
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Kolsrud, M. Covariant and hermitian semi-classical limit of quantum dynamical equations for spin-1/2 particles. Nuovo Cim 39, 504–518 (1965). https://doi.org/10.1007/BF02735820
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DOI: https://doi.org/10.1007/BF02735820