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arXiv math-ph/0309067math-phmath.MP
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一类奇异位势的微扰展开

Perturbation expansions for a class of singular potentials

Nasser Saad, Richard L. Hall, Attila B. von Keviczky

摘要:

应用Harrell的修正微扰理论[Ann.Phys.105,379-406(1977)],得到一类奇异哈密顿量H = -D^2 + x^2 + A/x^2 + lambda/x^alpha,(A \geq 0,alpha > 2)的非幂微扰展开式,称为广义尖峰谐振子。这里发展的微扰展开对于耦合λ> 0的小值是有效的,并且它们扩展了Harrell对于尖峰谐振子A = 0所得到的结果。并给出了激发态的计算公式。

英文摘要:

Harrell's modified perturbation theory [Ann. Phys. 105, 379-406 (1977)] is applied and extended to obtain non-power perturbation expansions for a class of singular Hamiltonians H = -D^2 + x^2 + A/x^2 + lambda/x^alpha, (A\geq 0, alpha > 2), known as generalized spiked harmonic oscillators. The perturbation expansions developed here are valid for small values of the coupling lambda > 0, and they extend the results which Harrell obtained for the spiked harmonic oscillator A = 0. Formulas for the the excited-states are also developed.

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