Many complex systems are effectively described by more general versions of statistical mechanics.
An example is a statistical mechanics based on q-entropies, where the canonical distributions are q-exponentials.
One can obtain these distributions in a non-equilibrium setting if chi-square distributed inverse temperature fluctuations are assumed. But there are other possibilities of complex behavior, for example lognormally distributed temperature fluctuations.
The two cases lead to chi-square and lognormal superstatistics, respectively. In this talk I give examples where a complex system exhibits a transition from one superstatistics to another. One such example is the statistics of Lagrangian turbulence, which is well described by chi-square superstatistics in the quantum case and by lognormal superstatistics in the classical case.
Another example is an observed transition from chi-square to lognormal superstatistics for some financial time series as a function of the time scale of returns.


Christian Beck

Invited Talk e-session


Photos by : Ivan