l’Univers dans tous ses états quantiques

Cosmology presents a vision of the Universe based on Einstein's general relativity, which is a classical theory of gravitation. At the same time, it is believed that the original variations in density from which the great structures (stars, galaxies, clusters, etc.) arose are due to quantum fluctuations in the vacuum. However, the two approaches, classical and quantum, are antagonistic, even incompatible, so the only way to proceed is to assume that all the mechanisms at work are quantum in nature, having evolved towards a universe that it is now possible to describe classically. If this description is correct, then the superposition principle of quantum mechanics, responsible for Schrôdinger's dead and alive cat problem, must apply to the entire Universe. From this we can deduce observational predictions that could enable us to know whether or not gravitation needs to be quantified.

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