Solutions to the nonlinear Schroedinger equation carrying momentum along a curve. Part I: study of the limit set and approximate solutions

Abstract

We prove existence of a special class of solutions to the (elliptic) Nonlinear Schroeodinger Equation $-{\epsilon }^2\Delta \psi +V(x)\psi =|\psi {|}^{p-1}\psi$, on a manifold or in the Euclidean space. Here V represents the potential, p an exponent greater than 1 and $\epsilon$ a small parameter corresponding to the Planck constant. As $\epsilon$ tends to zero (namely in the semiclassical limit) we prove existence of complex-valued solutions which concentrate along closed curves, and whose phase is highly oscillatory. Physically, these solutions carry quantum-mechanical momentum along the limit curves. In this first part we provide the characterization of the limit set, with natural stationarity and non-degeneracy conditions. We then construct an approximate solution up to order ${\epsilon }^2$, showing that these conditions appear naturally in a Taylor expansion of the equation in powers of $\epsilon$. Based on these, an existence result will be proved in the second part.

44 pages, 2 figures

References in corpus (1)

• Solutions to the nonlinear Schroedinger equation carrying momentum along a curve. Part II: proof of the existence result

Cited by in corpus (1)

• Solutions to the nonlinear Schroedinger equation carrying momentum along a curve. Part II: proof of the existence result