%0 Journal Article
%A Almarza, N. G.
%A Lomba, Enrique
%A Ruiz, Guiomar
%A Fernández Tejero, Carlos
%T Evidence of double criticality in a fluid model with density-dependent interactions
%D 2001
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/58869
%X Evidence of a liquid-liquid equilibrium in simple fluids has recently been exposed for a density-dependent pair potential in the framework of a van der Waals theory. Here this double criticality is investigated by means of computer simulation, a perturbation theory, and integral equation theory. It is found that the critical point estimated from the integral equation thermodynamics is not associated with divergent correlations. To cope with these features, a special simulation procedure, based on the definition of local densities, is devised. Monte Carlo calculations confirm the existence of two critical points, in agreement with the predictions of perturbation theory.
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