Endpoint Boundedness of Riesz Transforms on Hardy Spaces Associated with Operators

Details Endpoint Boundedness of Riesz Transforms on Hardy Spaces Associated with Operators Endpoint Boundedness of Riesz Transforms on Hardy Spaces Associated with Operators

2011-07-26

arxiv.org/abs/1107.5097v2

Mathematics

Classical Analysis and ODEs

15 pages; submitted

Scientific paper

Let $L_1$ be a nonnegative self-adjoint operator in $L^2({\mathbb R}^n)$ satisfying the Davies-Gaffney estimates and $L_2$ a second order divergence form elliptic operator with complex bounded measurable coefficients. A typical example of $L_1$ is the Schr\"odinger operator $-\Delta+V$, where $\Delta$ is the Laplace operator on ${\mathbb R}^n$ and $0\le V\in L^1_{\mathop\mathrm{loc}} ({\mathbb R}^n)$. Let $H^p_{L_i}(\mathbb{R}^n)$ be the Hardy space associated to $L_i$ for $i\in\{1,\,2\}$. In this paper, the authors prove that the Riesz transform $D (L_i^{-1/2})$ is bounded from $H^p_{L_i}(\mathbb{R}^n)$ to the classical weak Hardy space $WH^p(\mathbb{R}^n)$ in the critical case that $p=n/(n+1)$. Recall that it is known that $D (L_i^{-1/2})$ is bounded from $H^p_{L_i}(\mathbb{R}^n)$ to the classical Hardy space $H^p(\mathbb{R}^n)$ when $p\in(n/(n+1),\,1]$.

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