Closed virial equations for hard parallel cubes and squares

Details Closed virial equations for hard parallel cubes and squares Closed virial equations for hard parallel cubes and squares

2011-05-20

arxiv.org/abs/1105.4034v1

Physics

Condensed Matter

Statistical Mechanics

UFJF paper 12 pages 7 figures

Scientific paper

A correlation between maxima in virial coefficients (Bn), and "kissing" numbers for hard hyper-spheres up to dimension D=5, indicates a virial equation and close-packing relationship. Known virial coefficients up to B7, both for hard parallel cubes and squares, indicate that the limiting differences Bn-B(n-1) behave similar to spheres and disks, in the respective expansions relative to maximum close packing. In all cases, the increment Bn-B(n-1) will approach a negative constant with similar functional form in each dimension. This observation enables closed-virial equations-of-state for cubes and squares to be obtained. In both the 3D and 2D cases, the virial pressures begin to deviate from MD thermodynamic pressures at densities well-below crystallization. These results consolidate the general conclusion, from previous papers on spheres and disks, that the Mayer cluster expansion cannot represent the thermodynamic fluid phases up to freezing as commonly assumed in statistical theories.

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