The relation between liquid-liquid phase transitions and waterlike density anomalies in core-softened potentials of fluids was investigated in an exactly solvable one dimensional lattice model and a in a three dimensional fluid with fermi-like potential, the latter by molecular dynamics. Both systems were shown to present three liquid phases, two liquid-liquid phase transitions closely connected to two distinct regions of anomalous density increase. We propose that an oscillatory behavior observed on the thermal expansion coefficient as a function of pressure can be used as a signature of the connection between liquid-liquid phase and density.
@article{arxiv.1206.1572,
title = {Multiple liquid-liquid critical points and anomalies in core-softened potentials},
author = {Marco Aurélio A. Barbosa and Evy Salcedo and Marcia Barbosa},
journal= {arXiv preprint arXiv:1206.1572},
year = {2015}
}