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arXiv 1306.2778math.AP
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具有多阶时间分数阶导数的线性扩散方程的Initial-boundary value problems

Initial-boundary value problems for linear diffusion equation with multiple time-fractional derivatives

Zhiyuan Li, Masahiro Yamamoto

摘要:

本文讨论了具有多个时间分数阶导数的线性扩散方程的初边值问题。利用Mittag-Leffler函数和本征函数展开,将问题化为一个求解的积分方程,并应用不动点定理证明了解的存在唯一性和Hölder正则性.对于齐次方程的情况,解可以解析地扩展到扇区$\{z\in\mathbb{C};z\neq0,|\arg z|<\fracπ{2}\}$。在时间分数阶导数的系数均为正常数的情况下,利用拉普拉斯变换和解析性,证明了当一个函数在任意子边界上满足分数阶扩散方程和齐次Neumann边界条件,在整个边界上满足齐次Dirichlet边界条件时,该函数全同为零.

英文摘要:

In this paper, we discuss initial-boundary value problems for linear diffusion equation with multiple time-fractional derivatives. By means of the Mittag-Leffler function and the eigenfunction expansion, we reduce the problem to an integral equation for a solution, and we apply the fixed-point theorem to prove the unique existence and the Hölder regularity of solution. For the case of the homogeneous equation, the solution can be analytically extended to a sector $\{z\in\mathbb{C};z\neq0,|\arg z|<\fracπ{2}\}$. In the case where all the coefficients of the time-fractional derivatives are positive constants, by the Laplace transform and the analyticity, we can prove that if a function satisfies the fractional diffusion equation and the homogeneous Neumann boundary condition on arbitrary subboundary as well as the homogeneous Dirichlet boundary condition on the whole boundary, then it vanishes identically.

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