Type: Article
Publication Date: 2005-01-01
Citations: 161
DOI: https://doi.org/10.5802/aif.2094
Let ℒ= -div (A(x)∇) be a second order elliptic operator with real, symmetric, bounded measurable coefficients on ℝ n or on a bounded Lipschitz domain subject to Dirichlet boundary condition. For any fixed p>2, a necessary and sufficient condition is obtained for the boundedness of the Riesz transform ∇(ℒ) -1/2 on the L p space. As an application, for 1<p<3+ϵ, we establish the L p boundedness of Riesz transforms on Lipschitz domains for operators with VMO coefficients. The range of p is sharp. The closely related boundedness of ∇(ℒ) -1/2 on weighted L 2 spaces is also studied.