Two point eigenvalue correlation for a class of non-selfadjoint operators under random perturbations

Abstract

We consider a non-selfadjoint $h$-differential model operator $P_h$ in the semiclassical limit ($h\rightarrow 0$) subject to random perturbations with a small coupling constant $δ$. Assume that $\exp(-\frac{1}{Ch}) < δ\ll h^κ$ for constants $C,κ>0$ suitably large. Let $Σ$ be the closure of the range of the principal symbol. We study the $2$-point intensity measure of the random point process of eigenvalues of the randomly perturbed operator $P_h^δ$ and prove an $h$-asymptotic formula for the average $2$-point density of eigenvalues. With this we show that two eigenvalues of $P_h^δ$ in the interior of $Σ$ exhibit close range repulsion and long range decoupling.