Operational eternalism: conceptual lessons of indefinite causality

What did we learn after almost twenty years of research on indefinite causality?

I submit that the main take-away is a clear understanding of the unbridgeable gap between the operational approach and physical theory in spacetime. Much like the device-independent models of nonlocality in previous decades, the models of noncausality teach us a quantifiable lesson about the fundamental concepts of systems and observers. If -- to celebrate the 100 years of Heisenberg's approach with a slightly refreshed formulation -- one wishes for a theory founded exclusively on inputs and outputs of physical experiments, then the space-time theoretical paradigm based on a geometric conception of events becomes an obstacle to further progress.

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Speaker: Alexei Grinbaum (CEA, France)

Time: 17:00

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Operational eternalism: conceptual lessons of indefinite causality

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