The $L^p$ boundedness of wave operators for Schr\"odinger Operators with threshold singularities

TL;DR

This paper proves the boundedness of wave operators for Schr"odinger operators with threshold singularities on various $L^p$ spaces, extending known results to include $L^1$ and larger ranges of $p$ under certain orthogonality conditions.

Contribution

It establishes new $L^p$ boundedness results for wave operators at the threshold singularities, including the endpoint $L^1$, using direct kernel analysis and orthogonality conditions.

Findings

Wave operators are bounded on $L^1(\

Wave operators are bounded on $L^p$ for $1<p<n$ under orthogonality conditions.

Additional orthogonality conditions extend boundedness to all $1 extless p extless \infty$.

Abstract

Let $H=-\Delta+V$ be a Schr\"odinger operator on $L^2(\mathbb R^n)$ with real-valued potential $V$ for $n > 4$ and let $H_0=-\Delta$. If $V$ decays sufficiently, the wave operators $W_{\pm}=s-\lim_{t\to \pm\infty} e^{itH}e^{-itH_0}$ are known to be bounded on $L^p(\mathbb R^n)$ for all $1\leq p\leq \infty$ if zero is not an eigenvalue, and on $1<p<\frac{n}{2}$ if zero is an eigenvalue. We show that these wave operators are also bounded on $L^1(\mathbb R^n)$ by direct examination of the integral kernel of the leading term. Furthermore, if $\int_{\mathbb R^n} V(x) \phi(x) \, dx=0$ for all eigenfunctions $\phi$, then the wave operators are $L^p$ bounded for $1\leq p<n$. If, in addition $\int_{\mathbb R^n} xV(x) \phi(x) \, dx=0$, then the wave operators are bounded for $1\leq p<\infty$.