Comments on "State equation for the three-dimensional system of 'collapsing' hard spheres"
Abstract
A recent paper [I. Klebanov et al. Mod. Phys. Lett. B 22 (2008) 3153; arXiv:0712.0433] claims that the exact solution of the Percus-Yevick (PY) integral equation for a system of hard spheres plus a step potential is obtained. The aim of this paper is to show that Klebanov et al.'s result is incompatible with the PY equation since it violates two known cases: the low-density limit and the hard-sphere limit.
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