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arXiv 1803.03040math.APmath.CA
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相伴乘子算子的Carleman估计和有界性

Carleman estimates and boundedness of associated multiplier operators

Eunhee Jeong, Yehyun Kwon, Sanghyuk Lee

摘要:

令$P(D)$为拉普拉斯算子$Δ,$或波算子$\square$。以下类型的Carleman估计已知在一定范围的$p,q$上为真:具有独立于$v\in \mathbb{R}^d$的$C$的\[ \|e^{v\cdot x}u\|_{L^q(\mathbb{R}^d)} \le C\|e^{v\cdot x}P(D)u\|_{L^p(\mathbb{R}^d)} \]。这些估计是Kenig-Ruiz-Sogge \cite{KRS}和Jeong-Kwon-Lee \cite{JKL}关于二阶微分算子的一致Sobolev型估计的结果.对于具有非退化主部的二阶微分算子,完全刻划了一致Sobolev型估计成立的$p,q$的值域.但是,$p,q$的最佳范围,其中Carleman估计成立以前没有得到澄清。当$P(D)=Δ$,$\square$,或热算子,我们得到了一个完整的特征的容许$p,q$上述类型的Carleman估计。为此,我们研究了相关乘子算子的$L^p$ - $L^q$有界性.作为应用,我们还得到了一些唯一的延拓结果。

英文摘要:

Let $P(D)$ be the Laplacian $Δ,$ or the wave operator $\square$. The following type of Carleman estimate is known to be true on a certain range of $p,q$: \[ \|e^{v\cdot x}u\|_{L^q(\mathbb{R}^d)} \le C\|e^{v\cdot x}P(D)u\|_{L^p(\mathbb{R}^d)} \] with $C$ independent of $v\in \mathbb{R}^d$. The estimates are consequences of the uniform Sobolev type estimates for second order differential operators due to Kenig-Ruiz-Sogge \cite{KRS} and Jeong-Kwon-Lee \cite{JKL}. The range of $p,q$ for which the uniform Sobolev type estimates hold was completely characterized for the second order differential operators with nondegenerate principal part. But the optimal range of $p,q$ for which the Carleman estimate holds has not been clarified before. When $P(D)=Δ$, $\square$, or the heat operator, we obtain a complete characterization of the admissible $p,q$ for the aforementioned type of Carleman estimate. For this purpose we investigate $L^p$-$L^q$ boundedness of related multiplier operators. As applications, we also obtain some unique continuation results.

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