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According to the heat death theory of an expanding universe- entropy decreases. This would mean the temperature approaches absolute zero. But two problems arise:

  1. Absolute zero is impossible?
  2. Even if absolute temperature is reached, there is no way to go further while the universe is expanding- so the entropy cannot go any lower ?

Is my understanding incorrect or is there an unknown factor resolving this?

yolo
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1 Answers1

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Absolute zero is impossible?

Even at absolute zero the energy of the system is not zero due to the ZPE. So "absolute zero energy" is not a thing even when you lack heat.

Even if absolute temperature is reached, there is no way to go further while the universe is expanding- so the entropy cannot go any lower ?

We will never reach that point. Even in a classical model we would only approximate it, approaching it asymptotically.

Maury Markowitz
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