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arXiv 2610.20110math.AP
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分数梯度双线性型的核表示。第一部分:常系数

Kernel representations of fractional gradient bilinear forms. Part I. Constant coefficients

The University of Western Australia(西澳大利亚大学);Universidad de Granada(格拉纳达大学)

Serena Dipierro, Caterina Sportelli, Enrico Valdinoci

AI总结:

该论文研究Riesz分数梯度双线性型的对称积分核表示,完成了常系数情形的完整刻画,否定了[SS18]的一个开放问题,并指出非常数矩阵情形将在后续论文中探讨。

摘要:

我们研究与Riesz分数梯度相关的双线性型的对称积分核表示。受[SS18, 开放问题1.10]启发,我们完整描述了常系数情形。我们证明任意对称表示核是唯一确定的,并根据常矩阵A推导了其显式公式,这对核非负或一致正的矩阵给出了精确刻画。特别地,[SS18, 开放问题1.10]的答案是否定的(即使对于常矩阵)。我们还识别出一类非恒定的反对称无散扰动,它们对分数双线性型不可见,因此不改变表示核。非常数矩阵的一般情形表现出显著不同的行为,将是我们后续论文[DSV26]的主要研究主题。

英文摘要:

We study the representation of bilinear forms associated with Riesz fractional gradients by symmetric integral kernels. Motivated by [SS18, Open Problem 1.10], we give a complete description of the constant coefficient case. We prove that any symmetric representing kernel is uniquely determined and we derive its explicit formula in terms of the constant matrix $A$. This yields a sharp characterization of the matrices for which the kernel is either nonnegative or uniformly positive. In particular, [SS18, Open Problem 1.10] has a negative answer (even for constant matrices). We also identify a class of nonconstant antisymmetric divergence free perturbations that are invisible to the fractional bilinear form and hence leave the representing kernel unchanged. The general case of nonconstant matrices exhibits a substantially different behavior and will be the main subject of our forthcoming paper [DSV26].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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