Geometrothermodynamics

Abstract

We present the fundamentals of geometrothermodynamics, an approach to study the properties of thermodynamic systems in terms of differential geometric concepts. It is based, on the one hand, upon the well-known contact structure of the thermodynamic phase space and, on the other hand, on the metric structure of the space of thermodynamic equilibrium states. In order to make these two structures compatible we introduce a Legendre invariant set of metrics in the phase space, and demand that their pullback generates metrics on the space of equilibrium states. We show that Weinhold's metric, which was introduced {\it ad hoc}, is not contained within this invariant set. We propose alternative metrics which allow us to redefine the concept of thermodynamic length in an invariant manner and to study phase transitions in terms of curvature singularities.

Revised version, to be published in Jour. Math. Phys

References in corpus (6)

• Information Geometry and Phase Transitions
• Information Geometry, One, Two, Three (and Four)
• Curvature of the Weinhold metric for thermodynamical systems with 2 degrees of freedom
• Thermodynamic length in a 2-D thermodynamic state space
• Weinhold'length in an isentropic Ideal and quasi-Ideal Gas
• Weinhold'length in an isochoric thermodynamic system at constant heat capacity

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