title: Stability of phases of a square-well fluid within superposition approximation.
abstract: The analytic and numerical methods introduced previously to study the phase behavior of hard sphere fluids starting from the Yvon-Born-Green (YBG) equation under the Kirkwood superposition approximation (KSA) are adapted to the square-well fluid. We are able to show conclusively that the YBG equation under the KSA closure when applied to the square-well fluid: (i) predicts the existence of an absolute stability limit corresponding to freezing where undamped oscillations appear in the long-distance behavior of correlations, (ii) in accordance with earlier studies reveals the existence of a liquid-vapor transition by the appearance of a "near-critical region" where monotonically decaying correlations acquire very long range, although the system never loses stability.
authors: Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland.
authors: Jarosław
authors: J
authors: Piasecki
authors: Piotr
authors: P
authors: Szymczak
authors: John J
authors: JJ
authors: Kozak