Existence of minimizers for eigenvalues of the Dirichlet-Laplacian with a drift

Abstract

This paper deals with the eigenvalue problem for the operator $L=-\Delta -x\cdot \nabla$ with Dirichlet boundary conditions. We are interested in proving the existence of a set minimizing any eigenvalue ${\lambda }_k$ of $L$ under a suitable measure constraint suggested by the structure of the operator. More precisely we prove that for any $c>0$ and $k\in \mathbb{N}$ the following minimization problem $$ \min\left\{λ_k(Ω): \> Ω\>\mbox{quasi-open} \>\mbox{set}, \> \int_Ωe^{|x|^2/2}dx\le c\right\} $$ has a solution.