Scaling property and the generalized entropy uniquely determined by a fundamental nonlinear differential equation

Details Scaling property and the generalized entropy uniquely determined by a fundamental nonlinear differential equation Scaling property and the generalized entropy uniquely determined by a fundamental nonlinear differential equation

2006-07-31

arxiv.org/abs/cond-mat/0608007v2

Physics

Condensed Matter

Statistical Mechanics

Small mistakes are removed

Scientific paper

We derive a scaling property from a fundamental nonlinear differential equation whose solution is the so-called q-exponential function. A scaling property has been believed to be given by a power function only, but actually more general expression for the scaling property is found to be a solution of the above fundamental nonlinear differential equation. In fact, any power function is obtained by restricting the domain of the q-exponential function appropriately. As similarly as the correspondence between the exponential function and Shannon entropy, an appropriate generalization of Shannon entropy is expected for the scaling property. Although the q-exponential function is often appeared in the optimal distributions of some one-parameter generalized entropies such as Renyi entropy, only Tsallis entropy is uniquely derived from the algebra of the q-exponential function, whose uniqueness is shown in the two ways in this paper.

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