Stability for a formally determined inverse problem for a hyperbolic PDE with space and time dependent coefficients

Abstract

We prove stability for a formally determined inverse problem for a hyperbolic PDE where the coefficients depend on space and time variables. The hyperbolic operator has constant wave speed and we study the recovery of zeroth order and first order coefficients and the space dimension can be one or higher. We use a modification of the Bukhgeim-Klibanov method to obtain our results.

The statement and the proof of Theorem 1.6 in the revised version is an improvement of the statement and the proof of Theorem 1.6 in the original version - we need fewer directions in the revised version. We have also corrected an omission in the statement of Theorem 1.5 in the earlier version and corrected some typing errors