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arXiv · 2510.22700

Entropy of the cell fluid model with Curie-Weiss interaction

R. V. Romanik·O. A. Dobush·M. P. Kozlovskii·I. V. Pylyuk·M. A. Shpot
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Abstract

Entropy of the cell fluid model with Curie-Weiss interaction is obtained in analytical form as a function of temperature and chemical potential. A parametric equation is derived representing the entropy as a function of density. Features of both the entropy per particle and the entropy per cell are investigated at the entropy-density and entropy-chemical potential planes. The considered cell model is a multiple-occupancy model and possesses an infinite sequence of first-order phase transitions at sufficiently low temperatures. We find that the entropy exhibits pronounced minima at around integer-valued particle densities, which may be a generic feature of multiple-occupancy models.

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R. V. Romanik, O. A. Dobush, M. P. Kozlovskii, I. V. Pylyuk, M. A. Shpot. 2025-10-26. Entropy of the cell fluid model with Curie-Weiss interaction. https://arxiv.org/abs/2510.22700

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