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Cake day: February 27th, 2024

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  • Abstract

    We study the internal dynamics of a hypothetical spaceship traveling on a close timelike curve in an axially symmetric Universe. We choose the curve so that the generator of evolution in proper time is the angular momentum. Using Wigner’s theorem, we prove that the energy levels internal to the spaceship must undergo spontaneous discretization. The level separation turns out to be finely tuned so that, after completing a roundtrip of the curve, all systems are back to their initial state. This implies, for example, that the memories of an observer inside the spaceship are necessarily erased by the end of the journey. More in general, if there is an increase in entropy, a Poincaré cycle will eventually reverse it by the end of the loop, forcing entropy to decrease back to its initial value. We show that such decrease in entropy is in agreement with the eigenstate thermalization hypothesis. The non-existence of time-travel paradoxes follows as a rigorous corollary of our analysis.













  • Right. Keref Hinnom is 600BCE, so a wee bit earlier than the actual reference to ol’ King Shawshank redemption. But there’s oral tradition _probably_ running as early as 1200BCE. - I was talking Abrahamic tradition (as per the dude I was replying to, so not explicitly Christianity… in which case you’re completely correct)

    https://dokumen.pub/the-abrahamic-religions-a-very-short-introduction-very-short-introductions-627-1stnbsped-9780190654368-0190654341-9780190654344.html - Cohen, Charles L., ‘The Jewish matrix (1200 bce–70 ce)’, The Abrahamic Religions: A Very Short Introduction”