On the nonreflecting boundary operators for the general two dimensional Schrödinger equation

Of the two main objectives we pursue in this paper, the first one consists in the studying operators of the form (∂t−i△Γ)α, α=1/2,−1/2,−1,…, where △_Γ is the Laplace-Beltrami operator. These operators arise in the context of nonreflecting boundary conditions in the pseudo-differential approach for the general Schrödinger equation. The definition of such operators is discussed in various settings, and a formulation in terms of fractional operators is provided. The second objective consists in deriving corner conditions for a rectangular domain in order to make such domains amenable to the pseudo-differential approach. The stability and uniqueness of the solution is investigated for each of these novel boundary conditions.