Thermodynamics Since Einstein

Chih-Yueh WANG


Relativistic thermodynamics is a relatively unknown theory. Thermodynamic laws apply only to quasi-static processes that quickly change between states that are in a long-term equilibrium. However, special relativity postulates that the propagation speed of physical signals is constrained, thus limiting the speed of change in thermal states. Einstein was especially interested in the concept of temperature and the transformation formula of thermodynamic quantities in a moving frame of reference, having inspired numerous investigations for two centuries. This article reviews the historical development of relativistic thermodynamics since Einstein, beginning from the initial idea of Planck-Einstein in which a moving body warms up, to the notion of Blanusa-Ott in which a moving body cools down, and to that of Landsberg in which the temperature remains unchanged—depending on how the observer’s thermometer is defined. Current research focuses on identifying the correct form of relativistic Maxwell distribution to validate the related theory. Recent computational results using molecular dynamic simulations and their relevance to astrophysics are outlined as well.


Relativistic thermodynamics; Special relativity; Molecular dynamics

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