Modified wave operators and scattering for linear wave equations with a repulsive potential

In this work we consider the wave equation with a repulsive potential, either on the half line ${\mathbb R}^+$ or the Euclidean space ${\mathbb R}^d$ with $d\geq 3$. We combine the operator theory and the inward/outward energy theory to deduce a modified wave operator for repulsive potentials decaying like $|x|^{-β}$ with $β>1/3$. In particular the regular wave operator without modification exists if $β>1$. This implies that the asymptotic behaviour of finite-energy solutions to the wave equation $u_{tt} - Δu + |x|^{-β} u =0$ is similar to that of the solutions to the classic wave equation if $β\in (1,2)$.