Is Photons in Empty Space Even the Highest Entropy State of the Universe?

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The universe is going to keep expanding and emptying out until we are as empty as can be in what we call decider space. There's no rule that says the universe has to go through any particular state, black holes included, to get to a higher entropy state. This comes into deep questions about quantum gravity and how to relate cosmology and curvature of spacetime to more traditional thermodynamic notions.

Welcome to the December 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

Remember that I take a holiday break at the end of the year, so the next AMA will be at the beginning of February.

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