We just cannot have classical and quantum behavior at the same TIME

Frauchiger and Renner recently cast doubt on the universal applicability of Quantum Mechanics [1]. In the following, it is pointed out that their conclusion of one of three common-sense conditions, demanded for Quantum Mechanics, being inevitably and permanently violated is not inevitable; there is a way out. Here, it is argued for fully accepting encompassing complementarity and for a basic conceptualization of quantum mechanics, in which different aspects are exhibited under different circumstances. The reported result is taken as an indication of a fundamental arrow of time pointing in the direction from the quantum --> classical domain. With the origin of thermodynamic time at that interface, its unrestricted applicability in isolated quantum systems is questioned. The bold proposal is that TIME as we know it just does not exist at the quantum level. Time instead commences together with causality at all interfaces to the classic domain whenever a minimum amount of energy is transferred in an uncontrolled manner, i.e., without well-balanced compensation. Insisting on fully comprehensive self-consistency opens new perspectives on (retro-)causality and also on an inflation phase at the beginnings of our universe.

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