ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

For citation:

Zaburdaev V. J., Sokolov I. M. Fractional diffusion equation for aging and equilibrated random walks. Izvestiya VUZ. Applied Nonlinear Dynamics, 2009, vol. 17, iss. 4, pp. 79-97. DOI: 10.18500/0869-6632-2009-17-4-79-97

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Language: 
English
Heading: 
Review of Actual Problems of Nonlinear Dynamics
Article type: 
Review
UDC: 
536.76; 536-12.01
DOI: 
10.18500/0869-6632-2009-17-4-79-97

Fractional diffusion equation for aging and equilibrated random walks

Autors: 
Zaburdaev Vasilij Jurevich, Technische Universitßt Berlin
Sokolov Igor Mihajlovich, Technische Universitßt Berlin
Abstract: 

We consider continuous time random walks and discuss situations pertinent to aging. These correspond to the case when the initial state of the system is known not at preparation (at t = 0) but at the later instant of time t1 > 0 (intermediate-time initial condition). We derive the generalized aging diffusion equation for this case and express it through a single memory kernel. The results obtained are applied to the practically relevant case of the equilibrated random walks. We moreover discuss some subtleties in the setup of the aging subdiffusion problem and show that the behavior of the system depends on what was taken as the intermediate-time initial condition: whether it was coordinate of one particle given by measurement or the whole probability distribution. The two setups lead to different predictions for the evolution of a system. This fact stresses the necessity of a precise definition of aging statistical ensembles.

Key words: 
Continuous time random walks
generalized diffusion equation
aging
statistical ensemble
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Received: 
13.07.2009
Accepted: 
13.07.2009
Published: 
30.10.2009
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