A statistical model with a standard Gamma distribution

Details A statistical model with a standard Gamma distribution A statistical model with a standard Gamma distribution

2004-02-06

arxiv.org/abs/cond-mat/0402200v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, including 4 figures. Uses REVTeX style

Scientific paper

10.1103/PhysRevE.70.016104

We study a statistical model consisting of $N$ basic units which interact with each other by exchanging a physical entity, according to a given microscopic random law, depending on a parameter $\lambda$. We focus on the equilibrium or stationary distribution of the entity exchanged and verify through numerical fitting of the simulation data that the final form of the equilibrium distribution is that of a standard Gamma distribution. The model can be interpreted as a simple closed economy in which economic agents trade money and a saving criterion is fixed by the saving propensity $\lambda$. Alternatively, from the nature of the equilibrium distribution, we show that the model can also be interpreted as a perfect gas at an effective temperature $T(\lambda)$, where particles exchange energy in a space with an effective dimension $D(\lambda)$.

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