Determining nonsmooth first order terms from partial boundary measurements
Kim Knudsen - Department of Mathematical Sciences, Aalborg University, Denmark (email)
Abstract: We extend results of Dos Santos Ferreira-Kenig-Sjöstrand-Uhlmann (Comm. Math. Phys., 2007) to less smooth coefficients, and we show that measurements on part of the boundary for the magnetic Schrödinger operator determine uniquely the magnetic field related to a Hölder continuous potential. We give a similar result for determining a convection term. The proofs involve Carleman estimates, a smoothing procedure, and an extension of the Nakamura-Uhlmann pseudodifferential conjugation method to logarithmic Carleman weights.
Keywords: Inverse problem for magnetic Schrödinger operator with
Carleman estimate, semiclassical pseudodifferential calculus.
Received: September 2006; Published: April 2007.
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