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Wave Operators for Schr\"odinger Operators with Threshold Singuralities, Revisited
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abstract
The continuity property in the Sobolev space $W^{k,p}({\bf R}^m)$ of wave operators of scattering theory for $m$-dimensional single-body Schr\"odinger operator is considered when the resolvent of the operator has singularities at the bottom of the continuous spectrum. It is shown that they are continuous in $W^{k,p}({\bf R}^m)$, $0\leq k \leq 2$, for $1<p<3$ but not for $p>3$ if $m=3$ and, for $1<p<m/2$ but not for $p>m/2$ if $m\geq 5$. This extends the previously known interval of $p$ for the continuity, $3/2<p<3$ for $m=3$ and $m/(m-2)<p<m/2$ for $m\geq 5$. The formula which represents the integral kernel of the resolvent of the even dimensional free Sch\"odinger operator as the superposition of exponential-polynomial like functions substantially simplifies the proof of the previous paper when $m \geq 6$ is even.
Forward citations
Cited by 3 Pith papers
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