Analytic Wave Front Set for Solutions to Schr\"odinger Equations II -- Long Range Perturbations

TL;DR

This paper extends previous work on the analytic wave front set for Schrödinger solutions to include long-range perturbations, constructing a modified evolution operator and characterizing wave front sets via semiclassical decay.

Contribution

It generalizes the analytic wave front set analysis to long-range perturbations, allowing potentials with specific growth at infinity, and constructs a modified quantum evolution operator for this setting.

Findings

Characterizes the analytic wave front set for long-range perturbed Schrödinger equations.

Constructs a modified quantum evolution operator acting on Sjöstrand's spaces.

Extends previous results to potentials with growth like <x>^{2-ε} at infinity.

Abstract

This paper is a continuation of a paper by the authors: arXiv:0706.0415, where short range perturbations of the flat Euclidian metric where considered. Here, we generalize the results of the paper to long-range perturbations (in particular, we can allow potentials growing like $<x>^{2-\varepsilon}$ at infinity). More precisely, we construct a modified quantum free evolution $G_0(-s, hD_z)$ acting on Sj\"ostrand's spaces, and we characterize the analytic wave front set of the solution $e^{-itH}u_0$ of the Schr\"odinger equation, in terms of the semiclassical exponential decay of $G_0(-th^{-1}, hD_z)T u_0$, where $T$ stands for the Bargmann-transform. The result is valid for $t<0$ near the forward non trapping points, and for $t>0$ near the backward non trapping points. It is an extension of a paper by Nakamura (arXiv:math/0605742) to the analytic framework.