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arXiv 1111.1050math-phmath.MPnlin.SIquant-ph
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一类拟精确可解模型精确解的统一推导

Unified derivation of exact solutions for a class of quasi-exactly solvable models

Davids Agboola, Yao-Zhong Zhang

摘要:

我们提出了一类四个量子力学模型的精确解的统一处理,即奇异非谐势,广义量子保序振子,软核库仑势,和非多项式修正振子。我们证明了这四种情况都可归结为同一个基本常微分方程,这是准精确可解的。用Bethe近似法求出了基本方程的系统封闭解。利用这一结果,给出了四种情况下能量和允许势能参数的一般精确表达式,并以一组代数方程的根表示。在这些模型中还发现了一个隐藏的$sl(2)$代数结构。

英文摘要:

We present a unified treatment of exact solutions for a class of four quantum mechanical models, namely the singular anharmonic potential, the generalized quantum isotonic oscillator, the soft-core Coulomb potential, and the non-polynomially modified oscillator. We show that all four cases are reducible to the same basic ordinary differential equation, which is quasi-exactly solvable. A systematic and closed form solution to the basic equation is obtained via the Bethe ansatz method. Using the result, general exact expressions for the energies and the allowed potential parameters are given explicitly for each of the four cases in terms of the roots of a set of algebraic equations. A hidden $sl(2)$ algebraic structure is also discovered in these models.

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