Gaussian Waves and Edge Eigenvectors of Random Regular Graphs

Backhausz and Szegedy (2019) demonstrated that the almost eigenvectors of random regular graphs converge to Gaussian waves with variance $0\le {\sigma }^2\le 1$. In this paper, we present an alternative proof of this result for the edge eigenvectors of random regular graphs, establishing that the variance must be ${\sigma }^2=1$. Furthermore, we show that the eigenvalues and eigenvectors are asymptotically independent. Our approach introduces a simple framework linking the weak convergence of the imaginary part of the Green’s function to the convergence of eigenvectors, which may be of independent interest.