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We admit that the vacuum is not empty but is filled with continuouslyappearing and disappearing virtual fermion pairs. We show that if we simplymodel the propagation of the photon in vacuum as a series of transient captureswithin the virtual pairs, we can derive the finite light velocity $c$ as theaverage delay on the photon propagation. We then show that the vacuumpermittivity $\epsilon_0$ and permeability $\mu_0$ originate from thepolarization and the magnetization of the virtual fermions pairs. Since thetransit time of a photon is a statistical process within this model, we expectit to be fluctuating. We discuss experimental tests of this prediction. We alsostudy vacuum saturation effects under high photon density conditions.

A mechanism giving a finite value to the speed of light, and some experimental consequences