# Construction of invisible defects in acoustic waveguides

 Orateur: CHESNEL Lucas Localisation: École polytechnique, France Type: Séminaire problèmes spectraux en physique mathématique Site: IHP Salle: 314 Date de début: 09/05/2016 - 11:15 Date de fin: 09/05/2016 - 12:15

In this talk, we consider a time harmonic acoustic problem in a locally perturbed waveguide. We are interested in a situation where an observer generates incident propagative waves from $-\infty$ and measures the resulting scattered field at $-\infty$ and/or $+\infty$. We explain how to construct perturbations of the waveguide such that the scattered field is exponentially decaying at $-\infty$ and/or at $+\infty$, so that in practice, these defects are invisible to the observer.