The Weber equation as a normal form with applications to top of the barrier scattering

  • Rodica D. Costin

    The Ohio State University, Columbus, USA
  • Hyejin Park

    The Ohio State University, Columbus, USA
  • Wilhelm Schlag

    The Unversity of Chicago, USA
The Weber equation as a normal form with applications to top of the barrier scattering cover
Download PDF

A subscription is required to access this article.

Abstract

In the paper we revisit the basic problem of tunneling near a nondegenerate global maximum of a potential on the line. We reduce the semiclassical Schrödinger equation to a Weber normal form by means of the Liouville–Green transform. We show that the diffeomorphism which effects this stretching of the independent variable lies in the same regularity class as the potential (analytic or infinitely differentiable) with respect to both variables, i.e., space and energy. We then apply the Weber normal form to the scattering problem for energies near the potential maximum. In particular we obtain a representation of the scattering matrix which is accurate up to multiplicative factors of the form .

Cite this article

Rodica D. Costin, Hyejin Park, Wilhelm Schlag, The Weber equation as a normal form with applications to top of the barrier scattering. J. Spectr. Theory 8 (2018), no. 2, pp. 347–412

DOI 10.4171/JST/199