Nonlinear Bloch-Torrey Equation

Details Nonlinear Bloch-Torrey Equation Nonlinear Bloch-Torrey Equation

2010-03-29

arxiv.org/abs/1003.5422v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, no figures

Scientific paper

Recently, there has been an examination of the nonexponential relaxation profiles of the NMR signal. The exponential relaxation from Bloch-Torrey equations with constant diffusion coefficients are known to be an approximation, and research has been in areas that would reproduce non-exponential relaxation. These would be from statistical models, phenomenological models, and microscopic models including a recent fractional derivative approach. In this letter we derive a nonlinear Bloch-Torrey partial differential equation that has equivalently a non-constant diffusion coefficient and a linear probability and for which the solution is of a q-parametrized power-law distribution of the nonextensive Tsallis statistics.

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