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arXiv 2112.09486math.PR
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具有复空间变量的时间分数阶heat equations方程的随机解

Stochastic solutions for time-fractional heat equations with complex spatial variables

Luisa Beghin, Alessandro De Gregorio

摘要:

研究了具有时间分数阶导数的复空间扩散方程的随机解。特别是,我们复杂的积分算子解决方案的热型方程的时间导数被取代的卷积型推广的正规化Caputo衍生物。我们证明了该算子是具有复空间变量的复时间分数阶热方程的解。这种方法导致了一个包装的布朗运动在一个圆的时间变化的逆相关的从属。对这种时变布朗运动进行了分析,特别是得到了它的矩的一些结果,以及它作为连续时间随机游动的弱极限的构造.还提供了我们的方法的高维情况下的扩展。

英文摘要:

We deal with complex spatial diffusion equations with time-fractional derivative and study their stochastic solutions. In particular, we complexify the integral operator solution to the heat-type equation where the time derivative is replaced with the convolution-type generalization of the regularized Caputo derivative. We prove that this operator is solution of a complex time-fractional heat equation with complex spatial variable. This approach leads to a wrapped Brownian motion on a circle time-changed by the inverse of the related subordinator. This time-changed Brownian motion is analyzed and, in particular, some results on its moments, as well as its construction as weak limit of continuous-time random walks, are obtained. The extension of our approach to the higher dimensional case is also provided.

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