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A comment on Vacuum has friction from an effect similar to the Casimir effect. Parent comment

Re:Vacuum has friction from an effect similar to the Casimir... by harshpotatoes on Saturday February 12, 2011 @10:17AM (#2210133)
The speed in your definition would refer to the temperature of the particle, and not the temperature of the vacuum. This paper has both the vacuum and the particle not in thermal equilibrium, so the temperature of the vacuum is not due to the speed of the particle moving within it.

You can also have temperature from a photon flux.

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