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Subdiffusive behavior in a trapping potential: mean square displacement and velocity autocorrelation function

A theoretical framework for analyzing stochastic data from single-particle tracking in complex or viscoelastic materials and under the influence of a trapping potential is presented. Starting from a generalized Langevin equation we found explicit expressions for the two-time dynamics of the tracer particle. The mean square displacement and the velocity autocorrelation function of the diffusing particle are given in terms of the time lag. In particular, we investigate the subdiffusive case. The exact solutions are discussed and the validity of usual approximations are examined.

preprint2009arXivOpen access
M. A. DespósitoA. D. Viñales
cond-mat.stat-mech
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Open access2 authors1 topic
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M. A. DespósitoA. D. Viñales

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