arXiv2026
Let $Ω\subset\mathbb{C}^{n}$ be a bounded domain, and let $ρ:Ω\to[-1,0)$ be a smooth strictly plurisubharmonic exhaustion function. We consider the logarithmic potential $g=-\log(-ρ)$ and the associated complete Kähler metric $ω=dd^{c} g$. We prove that if $ρ$ satisfies the finite weighted Monge-Ampère mass condition with weight $(-ρ)^{\varepsilon}$ for every $\varepsilon>0$, then the spectrum and the essential spectrum of the Laplace-Beltrami operator of $(Ω,ω)$ both coincide with $[n^{2},\infty)$. In particular, the bottom of the spectrum satisfies $λ_{0}(Δ_ω,Ω)=n^{2}$, and $n^{2}$ is not an $L^{2}$-eigenvalue. For each $α> \frac{n}{2}$, we set $f=(-ρ)^α$ and prove that $f$ belongs to $W^{1,2}(Ω,ω)$ if and only if the Monge-Ampère mass of $ρ$ weighted by $(-ρ)^{2α-n}$ is finite. The integral identities underlying this equivalence, applied to the complex powers $(-ρ)^{α+it}$, give, after normalization, a singular Weyl sequence at every $n^{2}+4t^{2}$, $t\in\mathbb{R}$, as $α\downarrow\frac{n}{2}$. Combining our theorem with Cegrell's finite-mass exhaustion theorem, we obtain a complete Kähler metric with spectrum and essential spectrum equal to $[n^{2},\infty)$ on every bounded hyperconvex domain.