Anomalous Diffusion In Microrheology: A Comparative Study

Details Anomalous Diffusion In Microrheology: A Comparative Study Anomalous Diffusion In Microrheology: A Comparative Study

2008-03-26

arxiv.org/abs/0803.3761v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures

Scientific paper

10.1063/1.2897876

We present a comparative study on two theoretical descriptions of microrheological experiments. Using a generalized Langevin equation (GLE), we analyze the origin of the power-law behavior of the main properties of a viscoelastic medium. Then, we discuss the equivalence of the GLE with a generalized Fokker-Planck equation (GFPE), and how more general GFPE's can be derived from a thermo-kinetic formalism. These complementary theories lead to a justification for the physical nature of the Hurst exponent of fractional kinetics. Theory is compared with experiments.

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