Comptes Rendus
no. 9
Asymptotics of the solution of a Dirichlet spectral problem in a junction with highly oscillating boundary
[Approximation asymptotique des éléments propres du problème de Dirichlet pour le Laplacien dans un domaine à frontière fortement oscillante]

Présenté par : Évariste Sanchez-Palencia

Youcef Amirat1 ; Gregory A. Chechkin2, 3 ; Rustem R. Gadyl'shin4 
1 Laboratoire de mathématiques, CNRS UMR 6620, Université Blaise-Pascal, 63177 Aubière cedex, France
2 Department of Differential Equations, Faculty of Mechanics and Mathematics, Moscow Lomonosov State University, Moscow 119991, Russia
3 Narvik University College, Postboks 385, 8505 Narvik, Norway
4 Department of Mathematical Analysis, Faculty of Physics and Mathematics, Bashkir State Pedagogical University, Ufa 450000, Russia
Comptes Rendus. Mécanique, Volume 336 (2008) no. 9, pp. 693-698.

Nous étudions le comportement asymptotique des éléments propres du problème de Dirichlet pour le Laplacien dans un domaine borné dont une partie de la frontière, dépendant d'un petit paramètre ε, est fortement oscillante ; la fréquence des oscillations est d'ordre ε et leur amplitude est fixe. Nous présentons des approximations asymptotiques d'ordre deux des éléments propres dans le cas de valeurs propres simples du problème limite.

We study the asymptotic behavior of the eigenelements of the Dirichlet problem for the Laplacian in a bounded domain, a part of whose boundary, depending on a small parameter ε, is highly oscillating; the frequency of oscillations of the boundary is of order ε and the amplitude is fixed. We present second-order asymptotic approximations, as ε→0, of the eigenelements in the case of simple eigenvalues of the limit problem.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crme.2008.06.008
Keywords: Asymptotic expansion, Spectral problem, Oscillating boundary
Mot clés : Développement asymptotique, Problème spectral, Frontière oscillante
Youcef Amirat 1 ; Gregory A. Chechkin 2, 3 ; Rustem R. Gadyl'shin 4

1 Laboratoire de mathématiques, CNRS UMR 6620, Université Blaise-Pascal, 63177 Aubière cedex, France
2 Department of Differential Equations, Faculty of Mechanics and Mathematics, Moscow Lomonosov State University, Moscow 119991, Russia
3 Narvik University College, Postboks 385, 8505 Narvik, Norway
4 Department of Mathematical Analysis, Faculty of Physics and Mathematics, Bashkir State Pedagogical University, Ufa 450000, Russia 
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     title = {Asymptotics of the solution of a {Dirichlet} spectral problem in a junction with highly oscillating boundary},
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Youcef Amirat; Gregory A. Chechkin; Rustem R. Gadyl'shin. Asymptotics of the solution of a Dirichlet spectral problem in a junction with highly oscillating boundary. Comptes Rendus. Mécanique, Volume 336 (2008) no. 9, pp. 693-698. doi : 10.1016/j.crme.2008.06.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2008.06.008/

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