### Abstract

We propose a relativistic particle model without Grassmann variables which, being canonically quantized, leads to the Dirac equation. Both Γ-matrices and the relativistic spin tensor are produced through the canonical quantization of the classical variables which parametrize the properly constructed relativistic spin surface. Although there is no mass-shell constraint in our model, our particle's speed cannot exceed the speed of light. The classical dynamics of the model is in correspondence with the dynamics of mean values of the corresponding operators in the Dirac theory. In particular, the position variable experiences Zitterbewegung in noninteracting theory. The classical equations for the spin tensor are the same as those of the Barut-Zanghi model of a spinning particle.

Original language | English |
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Pages (from-to) | 398-406 |

Number of pages | 9 |

Journal | Annals of Physics |

Volume | 327 |

Issue number | 2 |

DOIs | |

Publication status | Published - 1 Feb 2012 |

Externally published | Yes |

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### Keywords

- Dirac equation
- Local (gauge) symmetries
- Relativistic spin
- Theories with constraints
- Zitterbewegung

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Annals of Physics*,

*327*(2), 398-406. https://doi.org/10.1016/j.aop.2011.11.019