Transient bi-fractional diffusion: space-time coupling inducing the coexistence of two fractional diffusions
© 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Anomalous diffusion is researched within the framework of the coupled continuous time random walk model, in which the space-time coupling is considered through the correlated function g(t) ~ t?, 0 = ?< 2, and the probability densit...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
Springer
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/72464 |
| Summary: | © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Anomalous diffusion is researched within the framework of the coupled continuous time random walk model, in which the space-time coupling is considered through the correlated function g(t) ~ t?, 0 = ?< 2, and the probability density function ?(t) of a particle’s transition time t follows a power law for large t: ?(t) ~ t- (1 + a),1 <a< 2. The bi-fractional generalized master equation is derived analytically which can be applied to describe the transient bi-fractional diffusion phenomenon which is induced by the space-time coupling and the asymptotic behavior of ?(t). Numerical results show that for the transient bi-fractional diffusion, there is a transition from one fractional diffusion to another one in the diffusive process. |
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