Relativistic Bohmian trajectories and Klein-Gordon currents for spin-0 particles
- Resource Type
- Working Paper
- Authors
- Alkhateeb, M.; Matzkin, A.
- Source
- Found. Phys. 52, 104 (2022)
- Subject
- Quantum Physics
High Energy Physics - Phenomenology
High Energy Physics - Theory
- Language
It is generally believed that the de Broglie-Bohm model does not admit a particle interpretation for massive relativistic spin-0 particles, on the basis that particle trajectories cannot be defined. We show this situation is due to the fact that in the standard (canonical) representation of the Klein-Gordon equation the wavefunction systematically contains superpositions of particle and anti-particle contributions.\ We argue that by working in a Foldy-Wouthuysen type representation uncoupling the particle from the anti-particle evolutions, a positive conserved density for a particle and associated density current can be defined.\ For the free Klein-Gordon equation the velocity field obtained from this current density appears to be well-behaved and sub-luminal in typical instances. As an illustration, Bohmian trajectories for a spin-0 boson distribution are computed numerically for free propagation in situations in which the standard velocity field would take arbitrarily high positive and negative values.