Inverse hyperbolic problems with time-dependent coefficients
Gregory Eskin
Abstract
We consider the inverse problem for the second order self-adjoint hyperbolic equation in a bounded domain in n with lower order terms depending analytically on the time variable. We prove that, assuming the BLR condition, the time-dependent Dirichlet-to-Neumann operator prescribed on a part of the boundary uniquely determines the coefficients of the hyperbolic equation up to a diffeomorphism and a gauge transformation. As a by-product we prove a similar result for the nonself-adjoint hyperbolic operator with time-independent coefficients.
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