Inserted: 14 feb 2009
We consider Cheeger-like shape optimization problems of the form
\alpha J(\Omega)\ :\ \Omega\subset D\big\}$$ where $D$ is a given bounded domain and $\alpha$ is above the natural scaling. We show the existence of a solution and analyze as $J(\Omega)$ the particular cases of the compliance functional $C(\Omega)$ and of the first eigenvalue $\lambda_1(\Omega)$ of the Dirichlet Laplacian. We prove that optimal sets are open and we obtain some necessary conditions of optimality.
Keywords: shape optimization, spectral optimization, Dirichlet eigenvalues