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Perfect vacuum, 0K or 4K?

alpha2cen
in Modern and Theoretical Physics

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In the perfect vacuum, there is no molecules in it, and the vacuum has no surround objects, i.e., too far away from the heat sources. As CMB theory, it is about 4K. Which one is correct 0K or 4K? If a vacuum is 4K, how can we drop the temperature to 0K?

Edited by alpha2cen

In the perfect vacuum, there is no molecules in it, and the vacuum has no surround objects, i.e., too far away from the heat sources. As CMB theory, it is about 4K. Which one is correct 0K or 4K? If a vacuum is 4K, how can we drop the temperature to 0K?

 

A "perfect" vacuum would not even have photons in it. Nothing would remain that could define a temperature.

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