Stability for a formally determined Lorentzian inverse problem

Abstract

We consider the inverse problem of recovering a potential $q$, depending on space and time, in the wave equation $({\square }_g+q)u=0$ on a Lorentzian manifold. We prove Lipschitz stability for a formally determined version of this problem under a \textit{null-cone foliation} assumption. As a consequence, we obtain uniqueness in the Lorentzian Calderón problem for $q$ under this assumption. Our approach is based on a modification of the Bukhgeim--Klibanov method using distorted plane waves.