Riesz transforms for 1≤𝑝≤2

Coulhon, Thierry; Duong, Xuan

doi:10.1090/S0002-9947-99-02090-5

Riesz transforms for $1\le p\le 2$
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Trans. Amer. Math. Soc. 351 (1999), 1151-1169 Request permission

Abstract:

It has been asked (see R. Strichartz, Analysis of the Laplacian$\dotsc$, J. Funct. Anal. 52 (1983), 48–79) whether one could extend to a reasonable class of non-compact Riemannian manifolds the $L^p$ boundedness of the Riesz transforms that holds in $\mathbb {R}^n$. Several partial answers have been given since. In the present paper, we give positive results for $1\leq p\leq 2$ under very weak assumptions, namely the doubling volume property and an optimal on-diagonal heat kernel estimate. In particular, we do not make any hypothesis on the space derivatives of the heat kernel. We also prove that the result cannot hold for $p>2$ under the same assumptions. Finally, we prove a similar result for the Riesz transforms on arbitrary domains of $\mathbb {R}^n$.

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