Journal
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
Volume 24, Issue 1-3, Pages 117-126Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cnsns.2015.01.001
Keywords
Infinitely divisible process; Subordination; Non-exponential relaxation; Levy walk; Anomalous diffusion
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Funding
- NCN Maestro [2012/06/A/ST1/00258]
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We derive the relaxation function from the simple model of two-state systems under memory effects caused by the subordination. The non-exponential relaxation is shown to result from subordination by inverse infinity divisible random processes. The wide class of such random processes includes ordinary alpha-stable, tempered alpha-stable, exponential, gamma processes and many others as particular cases. This approach generalizes the Cole-Cole, Cole-Davidson and Havriliak-Negami laws well known in experimental physics of relaxation. The presented considerations discover a direct (one-to-one) relationship between the method of random relaxation rates and the anomalous diffusion approach based on subordination of random processes that are applied for the theory of relaxation phenomena. Moreover, it is found that the space and time clusterizations are responsible on equal foots for power-law memory effects in relaxation of complex physical systems. (C) 2015 Elsevier B.V. All rights reserved.
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