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Physical Review Letters 85 (1985) 3587-3590
Caloric Curves and Energy Fluctuations in the Microcanonical Liquid-Gas Phase Transition
Ph. Chomaz1, Valentin Duflot1, 2, F. Gulminelli2

In this paper we study a microcanonical lattice gas model with a constrained average volume. We show that the caloric curve explicitly depends on the considered transformation of the volume with the excitation energy and so does not bear direct information on the characteristics of the phase transition. Conversely, partial energy fluctuations are demonstrated to be a direct measure of the equation of state. Since the heat capacity has a negative branch in the phase transition region, the presence of abnormally large kinetic energy fluctuations is a signal of the liquid-gas phase transition.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
Équipe Troposphère
Physique théorique
Physique/Physique Nucléaire Théorique