The wave equation with oscillating density: observability at low frequency
Centre de Mathématiques,
École Polytechnique, UMR 7640 du CNRS,
91128 Palaiseau Cedex, France; firstname.lastname@example.org.
Revised: 6 March 2000
We prove an observability estimate for a wave equation with rapidly oscillating density, in a bounded domain with Dirichlet boundary condition.
Mathematics Subject Classification: 35L05 / 35L20 / 35S15 / 93B07
Key words: Bloch wave / observability / microlocal defect measures.
© EDP Sciences, SMAI, 2000