Poisson problem with Hardy operator on lattice graph $ \mathbb{Z}^d$ and the application to semilinear equations

Abstract

In this paper, we investigate the analytic properties of the Hardy-type operator $-\Delta + \mu H_0$ on the $d$-dimensional integer lattice graph $\mathbb{Z}^d$, where $\mu \geq -1$ and $H_0$ is a critical Hardy potential at infinity--arising naturally from discrete Hardy inequalities. We derive sharp fixed-pole Green kernel estimates on $\mathbb{Z}^d$ and obtain a necessary and sufficient weighted summability condition characterizing the solvability of the nonnegative Poisson problem associated with this operator. Building upon this classification, we provide a complete characterization of the nonexistence of positive solutions to the semilinear elliptic inequality $$ -\Delta u + \mu H_0 u \geq W u^p \quad \text{in } \mathbb{Z}^d, $$ where $p>0$, $d \geq 3$, $\mu \geq -1$, and $H_0, W \in C(\mathbb{Z}^d)$ are strictly positive potentials satisfying the asymptotic behaviors $H_0(x) \sim |x|^{-2}$ and $W(x) \sim |x|^{\theta}$ as $|x| \to \infty$, with $\theta \in \mathbb{R}$.