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arXiv 1902.07035math.AP
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半群的分数高斯估计与全纯性

Fractional Gaussian estimates and holomorphy of semigroups

Valentin Keyantuo, Fabian Seoanes, Mahamadi Warma

摘要:

设$Ω\subset\R^N$是任意开集,用$(e^{-t(-Δ)_{\RR^N}^s})_{t\ge 0}$(其中$0<s<1$)表示$L^2(\RR^N)$上由分数Laplace算子生成的半群.本文的第一部分证明了:如果$T$是$L^2(Ω)$上的一个自伴半群,且满足分数高斯估计,则在$|T(t)f|\le e^{-t(-Δ)_{\RR^N}^s}|f|$,$0\le t \le 1$,$f\in L^2(Ω)$的意义下,$T$定义了一个有界的角$\fracπ{2}$的全纯半群,它插值于$L^p(Ω)$,$1\le p<\infty$ .利用对偶论证,我们证明了同样的结果也适用于连续函数空间。在第二部分中,我们将上述结果应用于分数阶算子的Dirichlet外条件的实现。

英文摘要:

Let $Ω\subset\R^N$ be an arbitrary open set and denote by $(e^{-t(-Δ)_{\RR^N}^s})_{t\ge 0}$ (where $0<s<1$) the semigroup on $L^2(\RR^N)$ generated by the fractional Laplace operator. In the first part of the paper we show that if $T$ is a self-adjoint semigroup on $L^2(Ω)$ satisfying a fractional Gaussian estimate in the sense that $|T(t)f|\le e^{-t(-Δ)_{\RR^N}^s}|f|$, $0\le t \le 1$, $f\in L^2(Ω)$, then $T$ defines a bounded holomorphic semigroup of angle $\fracπ{2}$ that interpolates on $L^p(Ω)$, $1\le p<\infty$. Using a duality argument we prove that the same result also holds on the space of continuous functions. In the second part, we apply the above results to realization of fractional order operators with the exterior Dirichlet conditions.

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