arXiv subjects

Martin Rivas

Publications and source records attributed to Martin Rivas.

21 records · Page 2Linked to original sources

arXiv2002

Are the electron spin and magnetic moment parallel or antiparallel vectors?

A direct measurement of the relative orientation between the spin and magnetic moment of the electron seems to be never performed. The kinematical theory of elementary particles developed by the author and the analysis of the expectation value of Dirac's magnetic moment operator show that, contrary to the usual assumption, spin and magnetic moment of electrons and positrons might have the same relative orientation. Two plausible experiments for their relative orientation measurement are proposed.

physics.gen-ph↗

arXiv2001

Generalized Lagrangians and spinning particles

The use of generalized Lagrangians for describing elementary particles was already claimed by Ostrogradskii. It is shown how the spin structure of elementary particles arises if one allows the Lagrangian to depend on higher order derivatives. One part is related to the rotation of the particle and the other, which is coming from the dependence of the Lagrangian on the acceleration, is known as the zitterbewegung part of spin.

physics.class-ph↗

arXiv1997

Classical spin contribution to the Tunnel Effect

Since the spin of real particles is of order of $\hbar$, it is difficult to distinguish in a quantum mechanical experiment involving spinning particles what part of the outcome is related to the spin contribution and what part is a pure quantum mechanical effect. We analyze in detail a classical model of a nonrelativistic spinning particle under the action of a potential barrier and compute numerically the crossing for different potentials. In this way it is shown that because of the spin structure there is a nonvanishing contribution to crossing for energies above a certain minimum value, even below the top of the potential barrier. Results are compared with the quantum tunnel effect.

hep-th↗