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arXiv 2111.04029math.AP
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具空间相关系数的非局部算子的有界性及非局部方程的$L_p$ -估计

Boundedness of non-local operators with spatially dependent coefficients and $L_p$-estimates for non-local equations

Hongjie Dong, Pilgyu Jung, Doyoon Kim

摘要:

我们证明了非局部算子\[ \mathcal{L}^a u(x)=\int_{\mathbb{R}^d} \left(u(x+y)-u(x)-χ_α(y)\big(\nabla u(x),y\big)\right) a(x,y)\frac{dy}{|y|^{d+α}} \]从$H_{p,w}^α(\mathbb{R}^d)$到$L_{p,w}(\mathbb{R}^d)$对整个$p \in (1,\infty)$值域的有界性,其中$w$是Muckenhoupt权.系数$a(x,y)$是有界的,仅在$y$中可测量,并且在$x$中具有任意小的指数的Hölder连续。我们通过移除$p$上的大假设以及考虑具有Muckenhoupt权的加权空间来扩展先前的结果。利用这个有界性结果,我们证明了相应的抛物型和椭圆型非局部方程在$L_p$空间中的唯一可解性。

英文摘要:

We prove the boundedness of the non-local operator \[ \mathcal{L}^a u(x)=\int_{\mathbb{R}^d} \left(u(x+y)-u(x)-χ_α(y)\big(\nabla u(x),y\big)\right) a(x,y)\frac{dy}{|y|^{d+α}} \] from $H_{p,w}^α(\mathbb{R}^d)$ to $L_{p,w}(\mathbb{R}^d)$ for the whole range of $p \in (1,\infty)$, where $w$ is a Muckenhoupt weight. The coefficient $a(x,y)$ is bounded, merely measurable in $y$, and Hölder continuous in $x$ with an arbitrarily small exponent. We extend the previous results by removing the largeness assumption on $p$ as well as considering weighted spaces with Muckenhoupt weights. Using the boundedness result, we prove the unique solvability in $L_p$ spaces of the corresponding parabolic and elliptic non-local equations.

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