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In this note, we first obtain the decomposition of the non-relativistic field velocity into the classical part (i.e., the velocity ~ w = ~p/m OF the center-of-mass (CM), and the so-called quantum part (i.e., the velocity ~ V of the motion IN the CM frame (namely, the internal spin–motion or Zitterbewegung), these two parts being orthogonal. Our starting… (More)

- Giovanni Salesi
- 2002

Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, 24044–Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: recami@mi.infn.it and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di Bergamo,… (More)

- Giovanni Salesi
- 1996

Inserting the correct Lorentz factor into the definition of the 4-velocity v for spinning particles entails new kinematical properties for v. The wellknown constraint (identically true for scalar particles, but entering also the Dirac theory, and assumed a priori in all spinning particle models) pμv μ = m is here derived in a self-consistent way. (†) Work… (More)

We start from the spinning electron theory by Barut and Zanghi, which has been recently translated into the Clifford algebra language. We “complete” such a translation, first of all, by expressing in the Clifford formalism a particular Barut–Zanghi (BZ) solution, which refers (at the classical limit) to an “internal” helical motion with a time–like speed… (More)

- Giovanni Salesi
- 2000

Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and D.M.O./FEEC and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: Erasmo.Recami@mi.infn.it and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di… (More)

- Giovanni Salesi
- 2002

In this paper we calculate the analytic expression of the phase time for the scattering of an electron off a complex square barrier. As is well known the (negative) imaginary part of the potential takes into account, phenomenologically, the absorption. We investigate the Hartman-Fletcher effect, and find that it is suppressed by the presence of a (not… (More)

This contribution is dedicated to the memory of D.D. Ivanenko, a pioneer in (among the others) non-linear spinorial theories. In a recent paper, we have investigated the classical theory of Barut and Zanghi (BZ) for the electron spin [which interpreted the Zitterbewegung (zbw) motion as an internal motion along helical paths], and its “quantum” version,… (More)

- Vladislav S. Olkhovsky, Giovanni Salesi
- 2000

Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and D.M.O./FEEC and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: Erasmo.Recami@mi.infn.it and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di… (More)

- Matej PAVŠIČ, Erasmo Recami, Waldyr Alves Rodrigues, Fabio Raciti, Giovanni Salesi
- 2002

The recent literature shows a renewed interest, with various independent approaches, in the classical models for spin. Considering the possible interest of those results, at least for the electron case, we purpose in this paper to explore their physical and mathematical meaning, by the natural and powerful language of Clifford algebras (which, incidentally,… (More)

- Giovanni Salesi
- 1998

The Barut–Zanghi (BZ) theory can be regarded as the most satisfactory picture of a classical spinning electron and constitutes a natural “classical limit” of the Dirac equation. The BZ model has been analytically studied in some previous papers of ours in the case of free particles. By contrast, in this letter we consider the case of external fields, and a… (More)