Resonances and balls in obstacle scattering with Neumann boundary conditions

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August 2008, 2(3): 335-340. doi: 10.3934/ipi.2008.2.335

Resonances and balls in obstacle scattering with Neumann boundary conditions

1.	Department of Mathematics, University of Missouri, Columbia, Missouri 65211, United States

Received January 2008 Revised June 2008 Published July 2008

Abstract
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We consider scattering by a smooth obstacle in $R^d$, $d\geq 3 $ odd. We show that for the Neumann Laplacian if an obstacle has the same resonances as the ball of radius $\rho$ does, then the obstacle is a ball of radius $\rho$. We give related results for obstacles which are disjoint unions of several balls of the same radius.

Keywords: resonances, inverse problems..

Mathematics Subject Classification: Primary: 35P25; Secondary: 47A40, 81U4.

Citation: T. J. Christiansen. Resonances and balls in obstacle scattering with Neumann boundary conditions. Inverse Problems & Imaging, 2008, 2 (3) : 335-340. doi: 10.3934/ipi.2008.2.335

References:

[1]	A. D. Alexandrov, To the theory of mixed volumes of convex bodies part II,, Mat. Sbornik, 2 (1937), 1205. Google Scholar
[2]	A. D. Alexandrov, "Selected Works. Part I. Selected Scientific Papers,'', Classics of Soviet Mathematics, (1996). Google Scholar
[3]	C. Bardos, J.-C. Guillot and J. Ralston, La relation de Poisson pour l'équation des ondes dans un ouvert non borné. Application à la théorie de la diffusion,, Comm. Partial Differential Equations, 7 (1982), 905. doi: 10.1080/03605308208820241. Google Scholar
[4]	T. Branson and P. Gilkey, The asymptotics of the Laplacian on a manifold with boundary,, Comm. Partial Differential Equations, 15 (1990), 245. doi: 10.1080/03605309908820686. Google Scholar
[5]	T. Christiansen, Spectral asymptotics for compactly supported perturbations of the Laplacian on Rⁿ,, Comm. Partial Differential Equations, 23 (1998), 933. doi: 10.1080/03605309808821373. Google Scholar
[6]	V. Guillemin and R. B. Melrose, The Poisson summation formula for manifolds with boundary,, Adv. in Math., 32 (1979), 204. doi: 10.1016/0001-8708(79)90042-2. Google Scholar
[7]	A. Hassell and M. Zworski, Resonant rigidity of s²,, J. Funct. Anal., 169 (1999), 604. doi: 10.1006/jfan.1999.3487. Google Scholar
[8]	R. B. Melrose, Scattering theory and the trace of the wave group,, J. Funct. Anal., 45 (1982), 29. doi: 10.1016/0022-1236(82)90003-9. Google Scholar
[9]	R. B. Melrose, Polynomial bound on the number of scattering poles,, J. Funct. Anal., 53 (1983), 287. doi: 10.1016/0022-1236(83)90036-8. Google Scholar
[10]	R. B. Melrose, Polynomial bound on the distribution of poles in scattering by an obstacle,, Journées Équations aux Dérivées partielles (1984), (1984), 1. Google Scholar
[11]	R. B. Melrose, "Geometric Scattering Theory,'' Stanford Lectures., Cambridge University Press, (1995). Google Scholar
[12]	V. Petkov and L. Stoyanov, "Geometry of Reflecting Rays and Inverse Spectral Problems,'', Pure and Applied Mathematics (New York). John Wiley & Sons, (). Google Scholar
[13]	V. Petkov and M. Zworski, Semi-classical estimates on the scattering determinant,, Ann. Henri Poincaré, 2 (2001), 675. doi: 10.1007/PL00001049. Google Scholar
[14]	M. Reed and B. Simon, "Methods of Modern Mathematical Physics. IV. Analysis of Operators,'', Academic Press [Harcourt Brace Jovanovich, (1978). Google Scholar
[15]	D. Robert, On the Weyl formula for obstacles,, in, (1995), 264. Google Scholar
[16]	J. Sjöstrand and M. Zworski, Complex scaling and the distribution of scattering poles,, J. Amer. Math. Soc., 4 (1991), 729. Google Scholar
[17]	J. Sjöstrand and M. Zworski, Lower bounds on the number of scattering poles, II,, J. Funct. Anal., 123 (1994), 336. doi: 10.1006/jfan.1994.1092. Google Scholar
[18]	M. E. Taylor, "Partial Differential Equations. II. Qualitative Studies of Linear Equations,'', Applied Mathematical Sciences, (1996). Google Scholar
[19]	M. Zworski, Poisson formulae for resonances,, Séminaire sur les Équations aux Dérivées Partielles, (1997), 1996. Google Scholar
[20]	M. Zworski, Poisson formula for resonances in even dimensions,, Asian J. Math., 2 (1998), 609. Google Scholar

show all references

References:

[1]	A. D. Alexandrov, To the theory of mixed volumes of convex bodies part II,, Mat. Sbornik, 2 (1937), 1205. Google Scholar
[2]	A. D. Alexandrov, "Selected Works. Part I. Selected Scientific Papers,'', Classics of Soviet Mathematics, (1996). Google Scholar
[3]	C. Bardos, J.-C. Guillot and J. Ralston, La relation de Poisson pour l'équation des ondes dans un ouvert non borné. Application à la théorie de la diffusion,, Comm. Partial Differential Equations, 7 (1982), 905. doi: 10.1080/03605308208820241. Google Scholar
[4]	T. Branson and P. Gilkey, The asymptotics of the Laplacian on a manifold with boundary,, Comm. Partial Differential Equations, 15 (1990), 245. doi: 10.1080/03605309908820686. Google Scholar
[5]	T. Christiansen, Spectral asymptotics for compactly supported perturbations of the Laplacian on Rⁿ,, Comm. Partial Differential Equations, 23 (1998), 933. doi: 10.1080/03605309808821373. Google Scholar
[6]	V. Guillemin and R. B. Melrose, The Poisson summation formula for manifolds with boundary,, Adv. in Math., 32 (1979), 204. doi: 10.1016/0001-8708(79)90042-2. Google Scholar
[7]	A. Hassell and M. Zworski, Resonant rigidity of s²,, J. Funct. Anal., 169 (1999), 604. doi: 10.1006/jfan.1999.3487. Google Scholar
[8]	R. B. Melrose, Scattering theory and the trace of the wave group,, J. Funct. Anal., 45 (1982), 29. doi: 10.1016/0022-1236(82)90003-9. Google Scholar
[9]	R. B. Melrose, Polynomial bound on the number of scattering poles,, J. Funct. Anal., 53 (1983), 287. doi: 10.1016/0022-1236(83)90036-8. Google Scholar
[10]	R. B. Melrose, Polynomial bound on the distribution of poles in scattering by an obstacle,, Journées Équations aux Dérivées partielles (1984), (1984), 1. Google Scholar
[11]	R. B. Melrose, "Geometric Scattering Theory,'' Stanford Lectures., Cambridge University Press, (1995). Google Scholar
[12]	V. Petkov and L. Stoyanov, "Geometry of Reflecting Rays and Inverse Spectral Problems,'', Pure and Applied Mathematics (New York). John Wiley & Sons, (). Google Scholar
[13]	V. Petkov and M. Zworski, Semi-classical estimates on the scattering determinant,, Ann. Henri Poincaré, 2 (2001), 675. doi: 10.1007/PL00001049. Google Scholar
[14]	M. Reed and B. Simon, "Methods of Modern Mathematical Physics. IV. Analysis of Operators,'', Academic Press [Harcourt Brace Jovanovich, (1978). Google Scholar
[15]	D. Robert, On the Weyl formula for obstacles,, in, (1995), 264. Google Scholar
[16]	J. Sjöstrand and M. Zworski, Complex scaling and the distribution of scattering poles,, J. Amer. Math. Soc., 4 (1991), 729. Google Scholar
[17]	J. Sjöstrand and M. Zworski, Lower bounds on the number of scattering poles, II,, J. Funct. Anal., 123 (1994), 336. doi: 10.1006/jfan.1994.1092. Google Scholar
[18]	M. E. Taylor, "Partial Differential Equations. II. Qualitative Studies of Linear Equations,'', Applied Mathematical Sciences, (1996). Google Scholar
[19]	M. Zworski, Poisson formulae for resonances,, Séminaire sur les Équations aux Dérivées Partielles, (1997), 1996. Google Scholar
[20]	M. Zworski, Poisson formula for resonances in even dimensions,, Asian J. Math., 2 (1998), 609. Google Scholar

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