A Multiphase Shape Optimization Problem for Eigenvalues: Qualitative Study and Numerical Results

We consider the multiphase shape optimization problem $\min\Big\{\sum_{i=1}^hλ_1(Ω_i)+α|Ω_i|:\ Ω_i\ \hbox{open},\ Ω_i\subset D,\ Ω_i\capΩ_j=\emptyset\Big\},$ where $α>0$ is a given constant and $D\subset\Bbb{R}^2$ is a bounded open set with Lipschitz boundary. We give some new results concerning the qualitative properties of the optimal sets and the regularity of the corresponding eigenfunctions. We also provide numerical results for the optimal partitions.

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