Everett@50 - Interpretation of Quantum Mechanics: 50 years on

Everett@50 - Interpretation of Quantum Mechanics: 50 years on

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Some remarkable implications of probabilities without time - Andreas Albrecht

I consider the ambiguity in quantum gravity that arises from the choice of clock. As I emphasize in earlier work (gr-qc/9408023) this ambiguity leads to an absolute lack of predictability for the laws of physics, or more specifically a complete absence of physical laws. I review the clock ambiguity and then consider possible ways forward given this seemingly critical failure. Remarkably, there is an approach that could lead to a certain amount of predictability in physics. I describe this approach and assess its prospects. I also draw attention to possible flaws in the original assumptions on which the clock ambiguity is based, with special emphasis on the definition of probabilities in the absence of time."