Does the entropy change from one frame to another In thermodynamics of relativity? and why?
If the entropy increases with time, it is less in the past. What is Lorentz's transformation?Or is it constant and why?
i don't remember well but the key could be that thermodynamic can't be written in a "covariance" way.
here is a reference about it: Article The Thermodynamic Covariance Principle
No, entropy is the same in all reference frames. Entropy is the logarithm of the number of accessible states and hence is a pure, dimensionless number. A pure number is a 0th-order tensor. (A vector is a 1st-order tensor.) 0th-order tensors transform into themselves in going from one reference frame to another. (Likewise, if there are 5 apples in one reference frame, there are 5 apples in all reference frames. 5 is a pure number. Of course, the mass, velocity, etc., of the apples depends on reference frame, but not the number of apples.)
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