What Does It Mean for a Star-Shaped 3D Scatterer to Be Small in the Time Domain?
Abstract
Abstract. In the frequency domain wave scattering problems, obstacles can be effectively replaced by point scatterers as soon as the wavelength of the incident wave exceeds significantly their diameter. The situation is less clear in the time domain, where recent works suggest the presence of an additional temporal scale that quantifies the small size of the obstacle. In this paper we argue that this is not necessarily the case, and that it is possible to construct asymptotic models with an error that does not deteriorate in time, at least in the case of a sound-soft scattering problem by a star-shaped obstacle in three dimensions.
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Authors: Maryna Kachanovska, A. Savchuk
Institutions: Centre National de la Recherche Scientifique, École Nationale Supérieure de Techniques Avancées, Institut national de recherche en sciences et technologies du numérique, Institut Polytechnique de Paris, POEMS: Propagation des Ondes : Etude Mathématique et Simulationan