On étudie le comportement asymptotique du spectre d'un problème elliptique à coefficients périodiques dans un domaine mince, à condition de Dirichlet nulle. On analyse deux cas : le cas où la périodicité des oscillations est du même ordre que l'épaisseur du domaine et le cas où la fréquence des oscillations est trés grande devant l'épaisseur. Une motivation physique est de comprendre le comportement de la densité de probabilité associée à la fonction d'onde d'une particule dans un domaine mince dont les propriétés oscillent fortement.
We study the asymptotic behavior of the spectrum of an elliptic operator with periodically oscillating coefficients, in a thin domain, with vanishing Dirichlet conditions. Two cases are treated: the case where the periodicity of the oscillations and the thickness of the domain have the same order of magnitude and the case where the oscillations have a frequency much greater than the thickness of the domain. A physical motivation can be to understand the behavior of the probability density associated to the wave function of a particle confined to a very thin domain, with periodically varying characteristics.
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@article{CRMATH_2008__346_9-10_579_0, author = {Ferreira, Rita and Mascarenhas, M. Lu{\'\i}sa}, title = {Waves in a thin and periodically oscillating medium}, journal = {Comptes Rendus. Math\'ematique}, pages = {579--584}, publisher = {Elsevier}, volume = {346}, number = {9-10}, year = {2008}, doi = {10.1016/j.crma.2008.03.007}, language = {en}, url = {http://www.numdam.org/articles/10.1016/j.crma.2008.03.007/} }
TY - JOUR AU - Ferreira, Rita AU - Mascarenhas, M. Luísa TI - Waves in a thin and periodically oscillating medium JO - Comptes Rendus. Mathématique PY - 2008 SP - 579 EP - 584 VL - 346 IS - 9-10 PB - Elsevier UR - http://www.numdam.org/articles/10.1016/j.crma.2008.03.007/ DO - 10.1016/j.crma.2008.03.007 LA - en ID - CRMATH_2008__346_9-10_579_0 ER -
%0 Journal Article %A Ferreira, Rita %A Mascarenhas, M. Luísa %T Waves in a thin and periodically oscillating medium %J Comptes Rendus. Mathématique %D 2008 %P 579-584 %V 346 %N 9-10 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.crma.2008.03.007/ %R 10.1016/j.crma.2008.03.007 %G en %F CRMATH_2008__346_9-10_579_0
Ferreira, Rita; Mascarenhas, M. Luísa. Waves in a thin and periodically oscillating medium. Comptes Rendus. Mathématique, Tome 346 (2008) no. 9-10, pp. 579-584. doi : 10.1016/j.crma.2008.03.007. http://www.numdam.org/articles/10.1016/j.crma.2008.03.007/
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