Relativistic spin dynamics conditioned by dark matter axions

Understand

The relativistic spin dynamics defined by the pseudoscalar field of dark matter axions is rigorously determined.

• The relativistic Hamiltonian in the Foldy-Wouthuysen representation is derived.
• It agrees with the previously obtained nonrelativistic Hamiltonians and the relativistic classical estimation of the axion wind effect.
• In the relativistic Hamiltonian, the biggest term describes the extraordinary (three orders of magnitude) enhancement of the axion wind effect in storage ring experiments as compared with experiments with immobile particles.