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Abstract. This paper considers a fully general (Riemann) wave equation on a finite-dimensional Riemannian manifold, with energy level (H 1 × L 2 ) -terms, under essentially minimal smoothness assumptions on the variable (in time and space) coefficients. The paper provides Carleman-type inequalities: first pointwise, for C 2 -solutions, then in integral form for H 1,1 (Q) -solutions. The aim of the present approach is to provide Carleman inequalities which do not contain lower-order terms, a distinguishing feature over most of the literature. Accordingly, global uniqueness results for overdetermined problems as well as Continuous Observability/ Uniform Stabilization inequalities follow in one shot, as a part of the same stream of arguments. Constants in the estimates are, therefore, generally explicit. The paper emphasizes the more challenging pure Neumann B.C. case. The paper is a generalization from the Euclidean to the Riemannian setting of [LTZ] in the more difficult case of purely Neumann B.C., and of [KK1] in the case of Dirichlet B.C. The approach is Riemann geometric, but different from—indeed, more flexible than—the one in [LTY1].
Applied Mathematics and Optimization – Springer Journals
Published: Dec 19, 2002
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