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arXiv math-ph/0508028math-phmath.FAmath.MP
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关于Fock空间中Hamilton算子的谱。离散谱渐近

On the spectrum of an Hamiltonian in Fock space. Discrete spectrum Asymptotics

Sergio Albeverio, Saidakhmat N. Lakaev, Tulkin H. Rasulov

摘要:

考虑了一个与描述三粒子相互作用的系统的能量算符相关联的模型算符$H$,而不考虑粒子数守恒。描述了$H$的本征光谱的精确位置和结构。对于广义Friedrichs模型在其本质谱底部存在共振的情形,证明了在$H$的本质谱底部以下存在无穷多个特征值.还建立了本质谱底部以下特征值的数量$N(z)$的渐近性。证明了当广义Friedrichs模型的本征值能量在本质谱的底部时,$H$在本质谱底部以下的本征值是有限的.

英文摘要:

A model operator $H$ associated with the energy operator of a system describing three particles in interaction, without conservation of the number of particles, is considered. The precise location and structure of the essential spectrum of $H$ is described. The existence of infinitely many eigenvalues below the bottom of the essential spectrum of $H$ is proved for the case where an associated generalized Friedrichs model has a resonance at the bottom of its essential spectrum. An asymptotics for the number $N(z)$ of eigenvalues below the bottom of the essential spectrum is also established. The finiteness of eigenvalues of $H$ below the bottom of the essential spectrum is proved if the associated generalized Friedrichs model has an eigenvalue with energy at the bottom of its essential spectrum.

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