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arXiv math-ph/0303001math-phmath.MPmath.SP
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无束缚态的半线Schrodinger算子

Half-line Schrodinger Operators With No Bound States

David Damanik, Rowan Killip

摘要:

我们认为薛定谔算子的半线,离散和连续的,并表明,没有束缚态意味着没有嵌入的奇异谱。更确切地说,在离散的情况下,我们证明,如果$Δ+ V$没有频谱以外的间隔$[-2,2]$,那么它有纯粹绝对连续谱。在连续统的情况下,我们表明,如果$-Δ+ V$和$-Δ- V$没有$[0,\infty)$以外的频谱,那么这两个运营商是纯粹绝对连续的。这些结果扩展到具有多个束缚态的算子。

英文摘要:

We consider Schödinger operators on the half-line, both discrete and continuous, and show that the absence of bound states implies the absence of embedded singular spectrum. More precisely, in the discrete case we prove that if $Δ+ V$ has no spectrum outside of the interval $[-2,2]$, then it has purely absolutely continuous spectrum. In the continuum case we show that if both $-Δ+ V$ and $-Δ- V$ have no spectrum outside $[0,\infty)$, then both operators are purely absolutely continuous. These results extend to operators with finitely many bound states.

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