Team organization may help swarms of flies to become invisible in closed waveguides

Lucas  Chesnel; Sergei A.  Nazarov

doi:10.3934/ipi.2016029

Article Contents

2016, Volume 10, Issue 4: 977-1006. Doi: 10.3934/ipi.2016029

This issue Previous Article FEM-based discretization-invariant MCMC methods for PDE-constrained Bayesian inverse problems Next Article The Bayesian formulation of EIT: Analysis and algorithms

Team organization may help swarms of flies to become invisible in closed waveguides

Lucas Chesnel^1, and
Sergei A. Nazarov^2,

1.
INRIA/Centre de mathématiques appliquées, École Polytechnique, Université Paris-Saclay, Route de Saclay, 91128 Palaiseau
2.
Faculty of Mathematics and Mechanics, St. Petersburg State University, Universitetskaya naberezhnaya, 7-9, 199034, St. Petersburg

Received: November 2015

Revised: July 2016

Published: November 2016

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Abstract

We are interested in a time harmonic acoustic problem in a waveguide containing flies. The flies are modelled by small sound soft obstacles. We explain how they should arrange to become invisible to an observer sending waves from $-\infty$ and measuring the resulting scattered field at the same position. We assume that the flies can control their position and/or their size. Both monomodal and multimodal regimes are considered. On the other hand, we show that any sound soft obstacle (non necessarily small) embedded in the waveguide always produces some non exponentially decaying scattered field at $+\infty$ for wavenumbers smaller than a constant that we explicit. As a consequence, for such wavenumbers, the flies cannot be made completely invisible to an observer equipped with a measurement device located at $+\infty$.

Keywords:

Mathematics Subject Classification: 35Q60, 65N21, 35R30.

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