On the Landis conjecture in a cylinder

TL;DR

This paper investigates the decay rates of solutions to a Schrödinger-type equation in a cylindrical domain with periodic boundary conditions, establishing bounds that depend on the dimension.

Contribution

It provides new decay rate bounds for solutions in a cylinder, extending understanding of the Landis conjecture in this geometric setting.

Findings

Decay rate is exponential in 1D and 2D cases.

Decay rate is exponential in |w|^{4/3} for dimensions 3 and higher.

Results apply to bounded potentials and real-valued solutions.

Abstract

The equation $- \Delta u + V u = 0$ in the cylinder $\mathbb{R} \times (0,2\pi)^d$ with periodic boundary conditions is considered. The potential $V$ is assumed to be bounded, and both functions $u$ and $V$ are assumed to be real-valued. It is shown that the fastest rate of decay at infinity of non-trivial solution $u$ is $O\left(e^{-c|w|}\right)$ for $d=1$ or $2$, and $O\left(e^{-c|w|^{4/3}}\right)$ for $d\ge 3$. Here $w$ is the axial variable.