Relativistic diffusion of elementary particles with spin

Details Relativistic diffusion of elementary particles with spin Relativistic diffusion of elementary particles with spin

2009-07-02

arxiv.org/abs/0907.0364v2

Journ.Phys.A42,445401(2009)

Physics

High Energy Physics

High Energy Physics - Theory

21 pages,minor changes,the version published in Journ.Phys.A

Scientific paper

We obtain a generalization of the relativistic diffusion of Schay and Dudley for particles with spin. The diffusion equation is a classical version of an equation for the Wigner function of an elementary particle. The elementary particle is described by a unitary irreducible representation of the Poincare group realized in the Hilbert space of wave functions in the momentum space. The arbitrariness of the Wigner rotation appears as a gauge freedom of the diffusion equation. The spin is described as a connection of a fiber bundle over the momentum hyperbolic space (the mass-shell). Motion in an electromagnetic field, transport equations and equilibrium states are discussed.

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