Independence of events and quantum structure of the light in Einstein's special relativity

Abstract

In the history of physics 1905 can be considered as the year of Einstein's proclamation of independence of events. Indeed the concept of independent events occupies a essential place in the three main 1905 Einstein's papers (quanta of light, brownian motion and special relativity). We show that the independent events and the independent points of light are inseparable not only in Einstein's 1905 paper on quanta of light but also in Einstein's 1905 paper on special relativity. Einstein's special relativity without ether is therefore based on a quantum conception of the light. We show also that there exists another special relativity with ether: Poincare's special relativity (based on the principle of relativity and the principle of real contraction of the lengths)without the concept of event and with a purely classical wavy conception of the light.