# Existence, uniqueness and regularity of the solution of the time-fractional Fokker-Planck equation with general forcing

## TL;DR

This paper establishes the existence, uniqueness, and regularity of solutions for a time-fractional Fokker-Planck equation with general forcing, extending previous work to more complex forcing functions and providing estimates useful for numerical analysis.

## Contribution

The paper proves existence, uniqueness, and regularity of solutions for a time-fractional Fokker-Planck equation with general forcing functions, including classical solutions for certain initial data.

## Key findings

- Existence and uniqueness of mild solutions under $L^2$ initial data.
- Classical solutions obtained for $u_0 ext{ in } H^2 ext{ and } H_0^1$ when $1/2< ext{alpha}<1$.
- Derivation of estimates for time derivatives of solutions.

## Abstract

A time-fractional Fokker-Planck initial-boundary value problem is considered, with differential operator $u_t-\nabla\cdot(\partial_t^{1-\alpha}\kappa_\alpha\nabla u-\textbf{F}\partial_t^{1-\alpha}u)$, where $0<\alpha <1$. The forcing function $\textbf{F} = \textbf{F}(t,x)$, which is more difficult to analyse than the case $\textbf{F}=\textbf{F}(x)$ investigated previously by other authors. The spatial domain $\Omega \subset\mathbb{R}^d$, where $d\ge 1$, has a smooth boundary. Existence, uniqueness and regularity of a mild solution $u$ is proved under the hypothesis that the initial data $u_0$ lies in $L^2(\Omega)$. For $1/2<\alpha<1$ and $u_0\in H^2(\Omega)\cap H_0^1(\Omega)$, it is shown that $u$ becomes a classical solution of the problem. Estimates of time derivatives of the classical solution are derived---these are known to be needed in numerical analyses of this problem.