#### Vol. 11, No. 6, 2018

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The inverse problem for the Dirichlet-to-Neumann map on Lorentzian manifolds

### Plamen Stefanov and Yang Yang

Vol. 11 (2018), No. 6, 1381–1414
##### Abstract

We consider the Dirichlet-to-Neumann map $\Lambda$ on a cylinder-like Lorentzian manifold related to the wave equation related to the metric $g$, the magnetic field $A$ and the potential $q$. We show that we can recover the jet of $g,A,q$ on the boundary from $\Lambda$ up to a gauge transformation in a stable way. We also show that $\Lambda$ recovers the following three invariants in a stable way: the lens relation of $g$, and the light ray transforms of $A$ and $q$. Moreover, $\Lambda$ is an FIO away from the diagonal with a canonical relation given by the lens relation. We present applications for recovery of $A$ and $q$ in a logarithmically stable way in the Minkowski case, and uniqueness with partial data.

##### Keywords
Lorentz, DN map, inverse problem, light ray transform, microlocal
##### Mathematical Subject Classification 2010
Primary: 35R30
Secondary: 35A27, 53B30