Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2000-09-07
Physics
Condensed Matter
Statistical Mechanics
5 pages, RevTeX. Submitted to Phys. Rev. Lett
Scientific paper
10.1209/epl/i2001-00270-x
A general density-functional formalism using an extended variable-space is presented for classical fluids in the canonical ensemble (CE). An exact equation is derived that plays the role of the Ornstein-Zernike (OZ) equation in the grand canonical ensemble (GCE). When applied to the ideal gas we obtain the exact result for the total correlation function h_N. For a homogeneous fluid with N particles the new equation only differs from OZ by 1/N and it allows to obtain an approximate expression for h_N in terms of its GCE counterpart that agrees with the expansion of h_N in powers of 1/N.
Velasco S.
White Jacob A.
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