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arXiv 1812.02421math.AP
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时空分数阶发展方程的从属原理及其应用

Subordination principle for space-time fractional evolution equations and some applications

Emilia Bazhlekova

摘要:

考虑了具有$β\in(0,1)$阶Caputo导数和算子$-A^α$,$α\in(0,1)$的分数阶发展方程的抽象Cauchy问题,其中$-A$在Banach空间上生成强连续单参数半群.导出了求解算子的隶属公式,它是包含隶属核(标量概率密度函数)和算子$C_0$ -半群的整表示.建立了从属核的一些性质,并给出了从属核的Mainardi函数和Lévy极值稳定密度的表示.给出了从属公式的应用,特别是对多维时空分数阶扩散方程的一些特殊的参数值。

英文摘要:

The abstract Cauchy problem for the fractional evolution equation with the Caputo derivative of order $β\in(0,1)$ and operator $-A^α$, $α\in(0,1)$, is considered, where $-A$ generates a strongly continuous one-parameter semigroup on a Banach space. Subordination formulae for the solution operator are derived, which are integral representations containing a subordination kernel (a scalar probability density function) and a $C_0$-semigroup of operators. Some properties of the subordination kernel are established and representations in terms of Mainardi function and Lévy extremal stable densities are derived. Applications of the subordination formulae are given with a special focus on the multi-dimensional space-time fractional diffusion equation for some special values of the parameters.

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