Sub-Gaussian heat kernel estimates and quasi Riesz transforms for $1\le p\le 2$

Abstract

On a complete non-compact Riemannian manifold $M$, we prove that a so-called quasi Riesz transform is always $L^p$ bounded for $1<p\le 2$. If $M$ satisfies the doubling volume property and the sub-Gaussian heat kernel estimate, we prove that the quasi Riesz transform is also of weak type $(1,1)$.

Final version, published in Publ. Mat., 2015

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