Abstract
It is proposed that an agent responsible for the acceleration of cosmic-ray particles, and in particular for the acceleration of cosmic-ray protons, is the zero-point universal background radiation. This proposition is based first on a classical model for polarizable particles interacting with a random electromagnetic field, due to Einstein and Hopf, and second on the conjecture that some cosmic-ray particles and in particular protons, due to their inner structure, can be polarized and respond like linear oscillators. An energy spectrum for cosmic-ray protons is derived and the braking effect of the microwave background as well as collisions with interstellar or intergalactic gas particles are discussed. Numerical fittings and simple predictions are presented. The analysis is carried classically in the manner of random or stochastic electrodynamics.
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