Failure of scattering to standing waves for a Schr\"{o}dinger equation with long-range nonlinearity on star graph

We consider the Schr"{o}dinger equation with power type long-range nonlinearity on star graph. Under a general boundary condition at the vertex, including Kirchhoff, Dirichlet, $\delta$, or ${\delta }^{\mathrm{\prime }}$ boundary condition, we show that the non-trivial global solution does not scatter to standing waves. Our proof is based on the argument by Murphy and Nakanishi, who treated the long-range nonlinear Schr"{o}dinger equation with a general potential in the Euclidean space, in order to consider general boundary conditions.