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arXiv 1712.03065math.APmath.CAmath.FA
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Grushin算子锐乘子定理的一种鲁棒方法

A robust approach to sharp multiplier theorems for Grushin operators

Gian Maria Dall'Ara, Alessio Martini

摘要:

本文证明了$\mathbb{R}^{d_1}_x \times \mathbb{R}^{d_2}_y$上$-Δ_x - V(x) Δ_y$形式的算子的Mihlin-Hörmander型乘子定理,其中$V(x) = \sum_{j=1}^{d_1} V_j(x_j)$,$V_j$是幂律$t \mapsto |t|^{2σ}$和$σ\in (1/2,\infty)$的扰动.无论何时使用$d_1 \geq σd_2$,结果都很清晰。结果的主要新颖之处在于它的鲁棒性:这似乎是第一个尖锐的乘子定理的非椭圆次椭圆算子允许步骤高于2和扰动的系数。证明依赖于一维薛定谔算子的本征值和本征函数的精确估计,这些本征值和本征函数在势的扰动下是稳定的。

英文摘要:

We prove a multiplier theorem of Mihlin-Hörmander type for operators of the form $-Δ_x - V(x) Δ_y$ on $\mathbb{R}^{d_1}_x \times \mathbb{R}^{d_2}_y$, where $V(x) = \sum_{j=1}^{d_1} V_j(x_j)$, the $V_j$ are perturbations of the power law $t \mapsto |t|^{2σ}$, and $σ\in (1/2,\infty)$. The result is sharp whenever $d_1 \geq σd_2$. The main novelty of the result resides in its robustness: this appears to be the first sharp multiplier theorem for nonelliptic subelliptic operators allowing for step higher than two and perturbation of the coefficients. The proof hinges on precise estimates for eigenvalues and eigenfunctions of one-dimensional Schrödinger operators, which are stable under perturbations of the potential.

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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