Optimal stability estimates for a Magnetic Schr\"odinger operator with local data

In this paper we prove identifiability and stability estimates for a local-data inverse boundary value problem for a magnetic Schr\"odinger operator in dimension $n\geq 3$. We assume that the inaccessible part of the boundary is part of a hyperplane. We improve the identifiability result obtained by Krupchyck, Lassas and Uhlmann [14] and also derive the corresponding stability estimates. We obtain $\log$-estimates for magnetic and electric potentials.