Fisher-information and the thermodynamics of scale-invariant systems

Details Fisher-information and the thermodynamics of scale-invariant systems Fisher-information and the thermodynamics of scale-invariant systems

2009-08-04

arxiv.org/abs/0908.0504v1

Physics

Physics and Society

Scientific paper

We present a thermodynamic formulation for scale-invariant systems based on the minimization with constraints of Fisher's information measure. In such a way a clear analogy between these systems's thermal properties and those of gases and fluids is seen to emerge in natural fashion. We focus attention on the non-interacting scenario, speaking thus of scale-free ideal gases (SFIGs) and present some empirical evidences regarding such disparate systems as electoral results, city populations and total citations in Physics journals, that seem to indicate that SFIGs do exist. We also illustrate the way in which Zipf's law can be understood in a thermodynamical context as the surface of a finite system. Finally, we derive an equivalent microscopic description of our systems which totally agrees with previous numerical simulations found in the literature.

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