The existence and convergence of solutions for the nonlinear Choquard equations on groups of polynomial growth

Abstract

In this paper, we study the nonlinear Choquard equation \begin{eqnarray*} Δ^{2}u-Δu+(1+λa(x))u=(R_α\ast|u|^{p})|u|^{p-2}u \end{eqnarray*} on a Cayley graph of a discrete group of polynomial growth with the homogeneous dimension $N\ge 2$, where $\alpha \in (0,N),p>\frac{N+\alpha }{N},\lambda$ is a positive parameter and $R_{\alpha }$ stands for the Green's function of the discrete fractional Laplacian, which has same asymptotics as the Riesz potential. Under some assumptions on $a(x)$, we establish the existence and asymptotic behavior of ground state solutions for the nonlinear Choquard equation by the method of Nehari manifold.

22 pages