Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-10-27
Physics
Condensed Matter
Statistical Mechanics
This work was reported on International conference "Mathematical physics and its applications" in Samara, Russia, 7-13 septemb
Scientific paper
In this article it is shown that in an equilibrium classical canonical ensemble of molecules with two-body interaction and external field full Gibbs distribution can be uniquely expressed in terms of a reduced two-particle distribution function. This means that while a number of particles $N$ and a volume $V$ are fixed the reduced two-particle distribution function contains as much information about the equilibrium system as the whole canonical distribution. The latter is represented as an absolutely convergent power series relative to the reduced two-particle distribution function. As an example a linear term of this expansion is calculated. It is also shown that Gibbs distribution function can de expressed in terms of reduced distribution function of the first order and pair correlation function.That is the later two functions contain the whole information about system under consideration.
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