Arbitrary Dirichlet Eigenvalue Multiplicities on Smooth Star-Shaped Euclidean Domains

Abstract

In every fixed dimension \(N\ge3\), for any finite list of positive integers \(m_1,\ldots,m_\ell\), we construct smooth strictly star-shaped Euclidean domains whose first \(\ell+1\) distinct Dirichlet eigenvalues can have multiplicities \(1,m_1,\ldots,m_\ell\) respectively. The condition "star-shaped" is almost optimal in the sense that this statement can not hold for bounded convex domains. In fact, we show that the $k$-th Dirichlet eigenvalue of any bounded convex domain has multiplicity at most $(N-1)(k-1)+1$, and this bound $N$ for the second Dirichlet eigenvalue is sharp.

arXiv comment47 pages