*Institute for Problems in Mechanics, Russian Academy of Sciences*

* 101-1 ,Vernadskii Ave., Moscow, 119526, Russia*

* email: rylov@ipmnet.ru*

Web site: http://rsfq1.physics.sunysb.edu/~rylov/yrylov.htm

or mirror Web site: http://gas-dyn.ipmnet.ru/~rylov/yrylov.htm

Updated October 19, 2004

Classical model *S*_{Dcl} of the Dirac particle *S*_{D} is constructed. *S*_{D} is the dynamic system described by the Dirac equation. For investigation of *S*_{D} and construction of *S*_{Dcl} one uses a new dynamic method: dynamic disquantization. This relativistic purely dynamic procedure does not use principles of quantum mechanics. The obtained classical analog *S*_{Dcl} is described by a system of ordinary differential equations, containing the quantum *h* as a parameter. Dynamic equations for S_{Dcl} are determined by the Dirac equation uniquely. The dynamic system *S*_{Dcl} has ten degrees of freedom and cannot be a pointlike particle, because it has an internal structure. There are two ways of interpretation of the dynamic system *S*_{Dcl}: (1) dynamical interpretation and (2) geometrical interpretation. In the dynamical interpretation the classical Dirac particle *S*_{Dcl} is a two-particle structure (special case of a relativistic rotator). It explains freely such properties of *S*_{D} as spin and magnetic moment, which are strange for pointlike structure. In the geometrical interpretation the world tube of *S*_{Dcl} is a ''two-dimensional broken band'', consisting of similar segments. These segments are parallelograms (or triangles), but not the straight line segments as in the case of a structureless particle. Geometrical interpretation of the classical Dirac *S*_{Dcl }generates a new approach to the elementary particle theory.

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