Doubling inequalities and propagation of smallness for Schrödinger equations with singular potentials

RESUMO

We study quantitative unique continuation for solutions of the Schrö\-din\-ger equation with complex-valued singular potentials \(V\in L^t\), \(t>d/2\). We obtain a family of scale-invariant \(L^p\to L^q\) Carleman inequalities for the Laplacian and use them to prove the doubling inequalities with explicit dependence on the \(L^t\)-norm of the potential. These estimates are combined with multiscale arguments to obtain propagation of smallness from arbitrary measurable sets of positive measure. As an application of the main results, we prove an upper bound for the BMO norm for the logarithms of Dirichlet-Laplace eigenfunctions in simply connected planar Lipschitz domains.