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arXiv quant-ph/0702213quant-ph
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WKB形式和某些势的束缚态能量本征态的下限

WKB formalism and a lower limit for the energy eigenstates of bound states for some potentials

Luis F. Barragan-Gil, Abel Camacho

摘要:

本文分析了量子力学的WKB近似形式中出现的条件。它表明,在一般情况下,仔细定义的近似方法需要引入两个长度参数,其中之一总是考虑在教科书上的量子力学,而第二个通常被忽略。然后,我们定义了一个特殊的家庭的潜力和证明,诉诸上述长度参数,我们可以找到一个能量是一个下界的系统的地面能量。这一思想被应用到谐振子的情况下,也到一个粒子自由下落的均匀引力场,在这两种情况下,我们的方法的一致性得到证实。这种方法,连同瑞利-里兹形式主义,使我们能够定义一个能量区间中的任何潜在的地面能量,属于我们的家庭,必须谎言。

英文摘要:

In the present work the conditions appearing in the WKB approximation formalism of quantum mechanics are analyzed. It is shown that, in general, a careful definition of an approximation method requires the introduction of two length parameters, one of them always considered in the text books on quantum mechanics, whereas the second one is usually neglected. Afterwards we define a particular family of potentials and prove, resorting to the aforementioned length parameters, that we may find an energy which is a lower bound to the ground energy of the system. The idea is applied to the case of a harmonic oscillator and also to a particle freely falling in a homogeneous gravitational field, and in both cases the consistency of our method is corroborated. This approach, together with the Rayleigh--Ritz formalism, allows us to define an energy interval in which the ground energy of any potential, belonging to our family, must lie.

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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