Sharp bounds for the number of the scattering poles
Georgi Vodev (1992)
Journées équations aux dérivées partielles
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Georgi Vodev (1992)
Journées équations aux dérivées partielles
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A. Martin (1974)
Recherche Coopérative sur Programme n°25
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Günter Stolz, Thomas Poerschke (1993)
Mathematische Zeitschrift
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V. Chiadò Piat, M. Codegone (2003)
RACSAM
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In this paper, we consider a family of scattering problems in perforated unbounded domains Ω. We assume that the perforation is contained in a bounded region and that the holes have a ?critical? size. We study the asymptotic behaviour of the outgoing solutions of the steady-state scattering problem and we prove that an extra term appears in the limit equation. Finally, we obtain convergence results for scattering frequencies and solutions.
Vesselin M. Petkov, Luchezar N. Stoyanov (1987)
Journées équations aux dérivées partielles
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D. R. Yafaev (1988-1989)
Séminaire Équations aux dérivées partielles (Polytechnique)
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Anders Melin (1987)
Journées équations aux dérivées partielles
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D. R. Yafaev (1986)
Annales de l'I.H.P. Physique théorique
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Tanya Christiansen, Mark S. Joshi (2000)
Journées équations aux dérivées partielles
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We consider perturbations of a stratified medium , where the operator studied is . The function is a perturbation of , which is constant for sufficiently large and satisfies some other conditions. Under certain restrictions on the perturbation , we give results on the Fourier integral operator structure of the scattering matrix. Moreover, we show that we can recover the asymptotic expansion at infinity of from knowledge of and the singularities of the scattering matrix at...