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Ehrenfest–Tolman effect

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The Ehrenfest–Tolman effect (also known as the Tolman–Ehrenfest effect), created by Richard C. Tolman and Paul Ehrenfest, argues that temperature is not constant in space at thermal equilibrium, but varies with the spacetime curvature. Specifically, it depends on the spacetime metric. In a stationary spacetime with timelike killing vector field , the temperature satisfies instead the Tolman-Ehrenfest relation: .This relationship leads to the concept of thermal time which has been considered as a possible basis for a fully general-relativistic thermodynamics. It has been shown that the Tolman–Ehrenfest effect can be derived by applying the equivalence principle to the concept that temperature is the rate of thermal time with respect to proper time.

Wikipedia Inglés http://en.wikipedia.org/wiki/Ehrenfest?Tolman_effect

Wikipedia Español http://es.wikipedia.org/wiki/Ehrenfest?Tolman_effect