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The fundamental solution of the space-time fractional advection-dispersion equation. (English) Zbl 1086.35003
Summary: A space-time fractional advection-dispersion equation (ADE) is a generalization of the classical ADE in which the first-order time derivative is replaced with Caputo derivative of order α(0,1], and the second-order space derivative is replaced with a Riesz-Feller derivative of order β(0,2]. We derive the solution of its Cauchy problem in terms of the Green functions and the representations of the Green function by applying its Fourier-Laplace transforms. The Green function also can be interpreted as a spatial probability density function (pdf) evolving in time. We do the same on another kind of space-time fractional advection-dispersion equation whose space and time derivatives both replacing with Caputo derivatives.
MSC:
35A08Fundamental solutions of PDE
35K57Reaction-diffusion equations
26A33Fractional derivatives and integrals (real functions)
49K20Optimal control problems with PDE (optimality conditions)
44A10Laplace transform
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