Thermodynamic phase transitions and shock singularities
Abstract
We show that under rather general assumptions on the form of the entropy function, the energy balance equation for a system in thermodynamic equilibrium is equivalent to a set of nonlinear equations of hydrodynamic type. This set of equations is integrable via the method of the characteristics and it provides the equation of state for the gas. The shock wave catastrophe set identifies the phase transition. A family of explicitly solvable models of nonhydrodynamic type such as the classical plasma and the ideal Bose gas are also discussed.
 Publication:

Proceedings of the Royal Society of London Series A
 Pub Date:
 March 2012
 DOI:
 10.1098/rspa.2011.0459
 arXiv:
 arXiv:1107.0394
 Bibcode:
 2012RSPSA.468..701D
 Keywords:

 Nonlinear Sciences  Exactly Solvable and Integrable Systems;
 Condensed Matter  Statistical Mechanics;
 Mathematical Physics
 EPrint:
 revised version, 18 pages, 6 figures