Triangle-Well and Ramp Interactions in One-Dimensional Fluids: A Fully Analytic Exact Solution

• Published in: Journal of statistical physics Vol. 175; no. 2; pp. 269 - 288
• Main Authors: Montero, Ana M., Santos, Andrés
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2019; Springer; Springer Nature B.V
• Subjects: Closures; Computational fluid dynamics; Dimensional analysis; Distribution functions; Equations of state; Internal energy; Mathematical and Computational Physics; Mathematical models; Physical Chemistry; Physics; Physics and Astronomy; Probability distributions; Quantum Physics; Radial distribution; Roads & highways; Statistical Physics and Dynamical Systems; Structure factor; Theoretical; Thermodynamic equilibrium; Thermodynamics; Widom line; Nearest neighbors; Ramp model; Radial distribution function; One-dimensional fluids; Fisher–Widom line; Triangle-well model
• ISSN: 0022-4715; 1572-9613
• DOI: 10.1007/s10955-019-02255-x

The exact statistical-mechanical solution for the equilibrium properties, both thermodynamic and structural, of one-dimensional fluids of particles interacting via the triangle-well and the ramp potentials is worked out. In contrast to previous studies, where the radial distribution function g ( r ) was obtained numerically from the structure factor by Fourier inversion, we provide a fully analytic representation of g ( r ) up to any desired distance. The solution is employed to perform an extensive study of the equation of state, the excess internal energy per particle, the residual multiparticle entropy, the structure factor, the radial distribution function, and the direct correlation function. In addition, scatter plots of the bridge function versus the indirect correlation function are used to gauge the reliability of the hypernetted-chain, Percus–Yevick, and Martynov–Sarkisov closures. Finally, the Fisher–Widom and Widom lines are obtained in the case of the triangle-well model.