Geometrothermodynamic Cosmology

We review the main aspects of geometrothermodynamics, a formalism that uses contact geometry and Riemannian geometry to describe the properties of thermodynamic systems. We show how to handle in a geometric way the invariance of classical thermodynamics with respect to Legendre transformations, which means that the properties of the systems do not depend on the choice of the thermodynamic potential. Moreover, we show that, in geometrothermodynamics, it is possible to apply a variational principle to generate thermodynamic fundamental equations, which can be used in the context of relativistic cosmology to generate cosmological models. As a particular example, we consider a fundamental equation that relates the entropy with the internal energy and the volume of the Universe, and construct cosmological models with arbitrary parameters, which can be fixed to reproduce the main aspects of the inflationary era and the standard cosmological paradigm.

Automated summary

This article reviews the main aspects of geometrothermodynamics, a formalism that employs contact geometry and Riemannian geometry to describe the properties of thermodynamic systems. It demonstrates how to handle the invariance of classical thermodynamics with respect to Legendre transformations in a geometric manner, ensuring that the properties of the systems remain unchanged regardless of the choice of thermodynamic potential. Additionally, it shows that geometrothermodynamics enables the application of a variational principle to generate thermodynamic fundamental equations, which can be used in the context of relativistic cosmology to generate cosmological models.