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On the curvature and torsion effects inone dimensional waveguides

Published online by Cambridge University Press:  05 September 2007

Guy Bouchitté ,
M. Luísa Mascarenhas  and
Luís Trabucho
Guy Bouchitté
Affiliation:
Département de Mathématiques, Université du Sud-Toulon-Var, BP 132, 83957 La Garde Cedex, France; bouchitte@univ-tln.fr
M. Luísa Mascarenhas
Affiliation:
Departamento de Matemática da F.C.T.-U.N.L. e C.M.A.-U.N.L., Quinta da Torre, 2829-516 Caparica, Portugal; mlfm@fct.unl.pt
Luís Trabucho
Affiliation:
Departamento de Matemática da F.C.-U.L. e C.M.A.F.-U.L., Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal; trabucho@ptmat.fc.ul.pt
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Abstract

We consider the Laplace operator in a thin tube of ${\mathbb R}^3$ with a Dirichlet condition on its boundary. We study asymptotically the spectrum of such an operator as the thickness of the tube's cross section goes to zero. In particular we analyse how the energy levels depend simultaneously on the curvature of the tube's central axis and on the rotation of the cross section with respect to the Frenet frame. The main argument is a Γ-convergence theorem for a suitable sequence of quadratic energies.

Keywords

Dimension reductionΓ-convergencecurvature and torsionwaveguides
Type
Research Article
Information
ESAIM: Control, Optimisation and Calculus of Variations , Volume 13 , Issue 4 , October 2007 , pp. 793 - 808
Copyright
© EDP Sciences, SMAI, 2007

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