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arXiv math-ph/0501024math-phmath.MPmath.SP
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与三粒子离散薛定谔算子相关的模型算子的本质谱和离散谱

On the essential and discrete spectrum of a model operator related to three-particle discrete Schrödinger operators

Sergio Albeverio, Saidakhmat N. Lakaev, Ramiza Kh. Djumanova

摘要:

研究了格点$\Z^3$上的三粒子离散薛定谔算符所对应的模型算符$H$。本文用两个Friedrichs模型的谱描述了本征谱,模型参数为$h_α(p),$ $α=1,2,$ $p \in \T^3=(-π,π]^3.$。证明了下列结果:1)在下列任一情形下,算子$H$有有限个本征值位于本征谱的底部以下:(i)两个算子$h_α(0), α=1,2,$都有零本征值;(ii)$h_1(0)$或$h_2(0)$都有零本征值。2)如果两个算子$h_α(0),α=1,2,$都有零能量共振,则算子$H$有无穷多个本征值,这些本征值位于本征谱的底部之下并在本征谱的底部累积。

英文摘要:

A model operator $H$ corresponding to a three-particle discrete Schrödinger operator on a lattice $\Z^3$ is studied. The essential spectrum is described via the spectrum of two Friedrichs models with parameters $h_α(p),$ $α=1,2,$ $p \in \T^3=(-π,π]^3.$ The following results are proven: 1) The operator $H$ has a finite number of eigenvalues lying below the bottom of the essential spectrum in any of the following cases: (i) both operators $h_α(0), α=1,2,$ have a zero eigenvalue; (ii) either $h_1(0)$ or $h_2(0)$ has a zero eigenvalue. 2) The operator $H$ has infinitely many eigenvalues lying below the bottom and accumulating at the bottom of the essential spectrum, if both operators $h_α(0),α=1,2,$ have a zero energy resonance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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