Transactions of the American Mathematical Society

Author(s): Mark L. Agranovsky; Eric Todd Quinto
Journal: Trans. Amer. Math. Soc. 355 (2003), 2439-2451.
MSC (2000): Primary 35L05, 44A12; Secondary 35B05, 35S30
Posted: January 14, 2003
Retrieve article in: PDF

Abstract: Let

be a crystallographic group in $\mathbb R^n$ generated by reflections and let $\Omega$ be the fundamental domain of

We characterize stationary sets for the wave equation in $\Omega$ when the initial data is supported in the interior of $\Omega.$ The stationary sets are the sets of time-invariant zeros of nontrivial solutions that are identically zero at

We show that, for these initial data, the

-dimensional part of the stationary sets consists of hyperplanes that are mirrors of a crystallographic group $\tilde W$ , $W<\tilde W.$ This part comes from a corresponding odd symmetry of the initial data.

In physical language, the result is that if the initial source is localized strictly inside of the crystalline $\Omega$ , then unmovable interference hypersurfaces can only be faces of a crystalline substructure of the original one.

1.: M. Agranovsky, C. Berenstein, and P. Kuchment Approximation by spherical waves in spaces, J. Geom. Analysis 6 (1996), 365-383. MR 99c:41038
2.: M. Agranovsky and E. T. Quinto, Injectivity sets for the Radon transform over circles and complete systems of radial functions, J. Funct. Anal. 139 (2), (1996), 383-414. MR 98g:58171
3.: M. Agranovsky and E. T. Quinto, Injectivity of the spherical mean operator and related problems, in: Complex Analysis, Harmonic Analysis and Applications (R. Deville et al, eds.), Addison Wesley, London, 1996, pp. 12-36. MR 97m:44004
4.: M. Agranovsky and E. T. Quinto, Geometry of stationary sets for the wave equation in $\mathbb R^n$ . The case of finitely supported initial data, Duke Math. J. 107 (2001), 57-84. MR 2001m:35192
5.: M. Agranovsky, V. V. Volchkov and L. Zalcman, Conical Uniqueness Sets for the Spherical Radon Transform, Bull. London Math. Soc., 31(1999), 231-236. MR 2000j:44002
6.: C. Bar, On nodal sets for Dirac and Laplace operators, Comm. Math. Phys., 188 (1997), 709-721. MR 98g:58179
7.: P. Bérard and D. Meyer Inégalités isopérimétriques et applications, Ann. Sci. École Norm. Sup. 15 (1982), 513-542. MR 84h:58147
8.: N. Bourbaki, Éléments de Mathématiques, Livre III, Topologie Générale, Actualités Sci. Ind., no 1092, Hermann et cie., Paris, 1947, MR 9:261a
9.: J. Brüning, Über Membranen mit speziellen Knotenlinien, Comment. Math. Helv. 55(1980), 13-19. MR 81e:53040
10.: L. S. Charlap, Bieberbach Groups and Flat Manifolds. Springer-Verlag, New York, 1986. MR 88j:57042
11.: S. Y. Cheng, Eigenfunctions and nodal sets, Comment. Math. Helv., 51 (1976), 43-55. MR 53:1661
12.: Courant R. and Hilbert D., Methods of Mathematical Physics, vol. 2, Interscience, New York, 1961. MR 25:4216
13.: H. Donnelly and C. Fefferman, Nodal sets of eigenfunctions on Riemannian manifolds, Invent. Math. 93 (1988), 161-183. MR 89m:58207
14.: -, Nodal sets for eigenfunctions of the Laplacian on surfaces, J. Amer. Math. Soc., 3 (1990), 333-353. MR 92d:58209
15.: R. Hardt and L. Simon, Nodal sets for solutions of elliptic equations, J. Diff. Geom. 30(1989), 505-522. MR 90m:58031
16.: M. Hoffmann-Ostenhof, T. Hoffmann-Ostenhof and N. Nadirashvili, The nodal line of the second eigenfunction of the Laplacian in $\mathbb R^2$ can be closed, Duke Math. J., 90 (1997), 3, 631-640. MR 98m:35146
17.: L. Hörmander, The Analysis of Linear Partial Differential Operators I, Springer-Verlag, New York, 1983. MR 85g:35002a

Retrieve articles in Transactions of the American Mathematical Society with MSC (2000): 35L05, 44A12, 35B05, 35S30

Mark L. Agranovsky
Affiliation: Bar Ilan University, Ramat Gan, Israel
Email: agranovs@macs.biu.ac.il

Eric Todd Quinto
Affiliation: Tufts University, Medford, Massachusetts
Email: todd.quinto@tufts.edu

DOI: 10.1090/S0002-9947-03-03228-8
PII: S 0002-9947(03)03228-8
Received by editor(s): September 4, 2002
Posted: January 14, 2003
Additional Notes: The first author was supported by the Israel Science Foundation (grant No. 279/02-1)
The second author was partially supported by NSF grants 9877155 and 0200788
Copyright of article: Copyright 2003, American Mathematical Society

			Journals Home Search Author Info Subscribe Tech Support Help
ISSN 1088-6850(e) ISSN 0002-9947(p)

Previous issue \| Table of contents \| Next issue Articles in press \| Recently posted articles \| Most recent issue \| All issues Previous Article \| Next Article


	Comments: webmaster@ams.org © Copyright 2009, American Mathematical Society Privacy Statement		Search the AMS