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On the equivalence of the parallel channel and the correlated cluster relaxation models
Authors:Karina Weron  Marcin Kotulski
Institution:(1) Institute of Physics, Technical University of Wrocław, Wyspiańskiego 27, 50-370 Wrocław, Poland;(2) Hugo Steinhaus Center for Stochastic Methods, Technical University of Wrocław, Wyspiańskiego 27, 50-370 Wrocław, Poland
Abstract:The question of the origins of nonexponential relaxation is addressed in terms of the probabilistic approach to relaxation. The interconnection between two differently rooted probabilistic models, i.e., between the parallel channel and the correlated cluster models, is presented. We show that clearly different probabilistic origins yield in both approaches a well-defined class of universally valid two-power-law responses with the stretched-exponential and exponential decay laws as special cases. The equivalence of both models indicates that variations in the local environment of the relaxing configurational units (parallel channel relaxation) can provide a basis for self-similar relaxation dynamics without the need for hierarchically constrained dynamics (correlated clusters relaxation).
Keywords:Universal relaxation law  general relaxation equation  Lévystable distribution  Mittag-Leffler distribution  Burr distribution
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