We construct time-dependent wave operators for Schr\"{o}dinger equations with
long-range potentials on a manifold M with asymptotically conic structure. We
use the two space scattering theory formalism, and a reference operator on a
space of the form R×∂M, where ∂M is the
boundary of M at infinity. We construct exact solutions to the
Hamilton-Jacobi equation on the reference system R×∂M, and prove the existence of the modified wave operators.Comment: 27 page