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arXiv 1109.2680hep-thquant-ph
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最小长度测不准关系下简谐振子和倒谐振子的位置和动量不变性

Position and Momentum Uncertainties of the Normal and Inverted Harmonic Oscillators under the Minimal Length Uncertainty Relation

Zachary Lewis, Tatsu Takeuchi

摘要:

本文在变形量子力学的背景下分析了谐振子能量本征态的位置和动量不确定性,即位置算符和动量算符之间的交换子由[x,p]=i \hbar(1+βp^2)给出.这种变形的对易关系导致最小长度测不准关系Δx >(\hbar /2)(1/Δp +βΔp),这意味着在小Δp时Δx ~ 1/Δp,而在大Δp时Δx ~ Δp。我们发现文献[1]中导出的简谐振子(m>0)的能量本征态的不确定性只分布在Δx ~ 1/Δp支上。另一个分支Δx ~ Δp是由“倒”谐振子(m<0)的能量本征态构成的。希尔伯特空间在“倒置”情形下允许正能量本征态的无限阶梯,条件是Δ x_{min} = \hbar \sqrt β > \sqrt{2} [ \hbar^2 /k |m| ]^{1/4}。与经典极限的对应关系也进行了讨论。

英文摘要:

We analyze the position and momentum uncertainties of the energy eigenstates of the harmonic oscillator in the context of a deformed quantum mechanics, namely, that in which the commutator between the position and momentum operators is given by [x,p]=i\hbar(1+βp^2). This deformed commutation relation leads to the minimal length uncertainty relation Δx > (\hbar/2)(1/Δp +βΔp), which implies that Δx ~ 1/Δp at small Δp while Δx ~ Δp at large Δp. We find that the uncertainties of the energy eigenstates of the normal harmonic oscillator (m>0), derived in Ref. [1], only populate the Δx ~ 1/Δp branch. The other branch, Δx ~ Δp, is found to be populated by the energy eigenstates of the `inverted' harmonic oscillator (m<0). The Hilbert space in the 'inverted' case admits an infinite ladder of positive energy eigenstates provided that Δx_{min} = \hbar\sqrtβ > \sqrt{2} [\hbar^2/k|m|]^{1/4}. Correspondence with the classical limit is also discussed.

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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