Scale-invariant systems | Information theory

Scale-free ideal gas

The scale-free ideal gas (SFIG) is a physical model assuming a collection of non-interacting elements with a stochastic proportional growth. It is the scale-invariant version of an ideal gas. Some cases of city-population, electoral results and cites to scientific journals can be approximately considered scale-free ideal gases. In a one-dimensional discrete model with size-parameter k, where k1 and kM are the minimum and maximum allowed sizes respectively, and v = dk/dt is the growth, the bulk probability density function F(k, v) of a scale-free ideal gas follows where N is the total number of elements, Ω = ln k1/kM is the logaritmic "volume" of the system, is the mean relative growth and is the standard deviation of the relative growth. The entropy equation of state is where is a constant that accounts for dimensionality and is the elementary volume in phase space, with the elementary time and M the total number of allowed discrete sizes. This expression has the same form as the one-dimensional ideal gas, changing the thermodynamical variables (N, V, T) by (N, Ω,σw). Zipf's law may emerge in the external limits of the density since it is a special regime of scale-free ideal gases. (Wikipedia).

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Related pages

Zipf's law | Entropy | Stochastic | Probability density function | Scale invariance