Faber-Krahn and Lieb-type inequalities for the composite membrane problem. (English) Zbl 1481.35296
Summary: The classical Faber-Krahn inequality states that, among all domains with given measure, the ball has the smallest first Dirichlet eigenvalue of the Laplacian. Another inequality related to the first eigenvalue of the Laplacian has been proved by Lieb in 1983 and it relates the first Dirichlet eigenvalues of the Laplacian of two different domains with the first Dirichlet eigenvalue of the intersection of translations of them. In this paper we prove the analogue of Faber-Krahn and Lieb inequalities for the composite membrane problem.
MSC:
| 35P15 | Estimates of eigenvalues in context of PDEs |
| 35B06 | Symmetries, invariants, etc. in context of PDEs |
| 35J25 | Boundary value problems for second-order elliptic equations |
| 49Q10 | Optimization of shapes other than minimal surfaces |
Keywords:
Faber-Krahn inequality; Lieb inequality; rearrangement; first Dirichlet eigenvalue of the Laplacian; composite membrane problemReferences:
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