‘Fractional’ kinetic equations and ‘universal’ decoupling of a memory function in mesoscale region

R.R. Nigmatullin

Physica A: Statistical Mechanics and its Applications, 2006, vol. 363, issue 2, 282-298

Abstract: It is proved that kinetic equations containing non-integer integrals and derivatives appear in the result of reduction of a set of micromotions to some averaged collective motion in the mesoscale region. In other words, it means that after a proper statistical average the microscopic dynamics is converted into a collective motion in the mesoscopic regime. A fractal medium containing weakly and strongly correlated relaxation units has been considered. It is shown that in most cases the original of the memory function recovers the Riemann–Liouville integral. For a strongly correlated fractal medium a generalization of the Riemann–Liouville integral is obtained. For the fractal-branched processes one can derive the stretched-exponential law of relaxation that is widely used for description of relaxation phenomena in disordered media. It is shown that the generalized stretched-exponential function describes the averaged collective motion in the fractal-branched complex systems. It is confirmed that the generalized stretched-exponential law can be definitely applicable for description of a set of spontaneous/evoked postsynaptic signals in the living matter. The application of these fractional kinetic equations for the description of the dielectric relaxation phenomena is also discussed. These kinetic equations and their generalizations can be applicable for the description of different relaxation or diffusion processes in the intermediate (mesoscale) region.

Keywords: Memory function; Kinetic equations with non-integer operators of differentiation/integration containing real and complex-conjugate power-law exponents; The generalized Riemann–Liouville integral; Linear response and Mori–Zwanzig kinetic equations; The ‘universal’ decoupling procedure (search for similar items in EconPapers)
Date: 2006
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:363:y:2006:i:2:p:282-298

DOI: 10.1016/j.physa.2005.08.033

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