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arXiv · 2610.19469

Weak type $(1,1)$ estimates for Riesz transforms of elliptic operators and magnetic Schrödinger operators

El Maati Ouhabaz
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Abstract

Let $M$ be a complete Riemannian manifold and define a magnetic Schrödinger operator $\LL = ({\bf d}+ iA)^*({\bf d}+iA) + V$ where $A$ is a real $1$-differential form in $L^2_{loc}$ and $V \in L^1_{loc}$ is a nonnegative electric potential. We prove that the magnetic Riesz transform $({\bf d} + iA) \LL^{-\einhalb}$ is of weak type $(1,1)$ with bound at most $2$. It extends to a bounded operator on $L^p$ for $p \in (1, 2]$ with norm bounded by a constant $c_p$ depending only on $p$. It is then independent of the dimension of the manifold and independent of $A$ and $V$. We also prove weak type $(1,1)$ bounds for symmetric elliptic operators subject to various boundary conditions on rough domains of $\RR^d$. The proofs are based on a new weak type $(1,1)$ criterion for operators.

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El Maati Ouhabaz. 2026-10-14. Weak type $(1,1)$ estimates for Riesz transforms of elliptic operators and magnetic Schrödinger operators. https://arxiv.org/abs/2610.19469

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