Sharp dispersive estimates for wave equation on lattice graphs with high dimension

Abstract

Schultz [Comm.~Pure~Appl.~Math., 1998] first established dispersive estimates for the fundamental solution of the discrete wave equation on lattice graphs ${\mathbb{Z}}^d$ for $d=2,3$, which can be seen as a discrete analogue of the classical dispersive estimate for the Euclidean wave equation. His result was extended by Bi, Cheng and Hua to $d=4$ and $5$. In this paper, we give complete answers to all the remaining dimensions, including $d=5$. Our estimate is sharp for every $d\ge 5$. Moreover, the proof remains valid for the upper bound of the case for $d=4$.