Talks

Einstein’s profound ideas about relativity and the quantum have provided generations of people with some of the most thought-provoking concepts ever proposed about the wonders and mysteries of our universe. This lively panel discussion will examine Einstein’s enormous contributions to our understanding. Relativity, Smolin, Stachel, Moffat, Einstein, relativity theory, revolutionary, quantum, Planck, unified field theory, social impact, scientific revolution, physics, history

We point out that there exit operators, having a clear meaning in cosmology -- they select a given realization of the distribution of primordial density fluctuations --, which can violate Bell inequalities when evaluated in the ''standard'' inflationary quantum distribution. We then consider density matrices which describe partially decohered distributions and show how the importance of the violation decreases with the decoherence level. We determine the critical level beyond which no violation can be obtained. We argue that the corresponding density matrix is the quantum version of the stochastic ensemble used in numerical codes, and consisting of growing modes with random amplitudes.