Inequalities between Dirichlet and Neumann eigenvalues in large dimensions

Abstract

Let $Ω$ be a bounded domain in $R^d$. Denote by $λ_k$ (resp. $μ_k$) the eigenvalues of the Laplace operator in $Ω$ with Dirichlet (resp. Neumann) boundary conditions. Denote by $Ψ= Ψ(d,k,Ω)$ the shift of indices in the inequality $μ_{k+Ψ} \le λ_k$. We are interested to describe the behaviour of $Ψ$ for large $d$. We prove that a) $Ψ(d,1,Ω) \ge C (e/2)^d$ for all domains $Ω$; and b) $Ψ(d,k,Ω) \ge C (e/2)^d$ for all $k$ and all convex domains $Ω$.