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arXiv 1508.04549quant-phcond-mat.stat-mechgr-qc
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su(1,1)的相干态:关联、涨落和赝谐振子

Coherent States of su(1,1): Correlations, Fluctuations, and the Pseudoharmonic Oscillator

John Schliemann

摘要:

我们将最近关于相干振子态和SU(2)相干态的期望值的结果推广到su(1,1)的离散表示的情形。导出了任意算子乘积的系统半经典展开式。特别是,领导秩序的能量不确定性的任意哈密顿量被发现纯粹的经典变量的时间依赖性。这里考虑的相干态包括Perelomov-Gilmore相干态。作为一个重要的应用,我们讨论了赝谐振子,并将Perelomov-Gilmore态与Barut和Girardello引入的态进行了比较。后者的结果是更接近经典的极限,因为它们的相对能量方差衰减与能量的平方根的倒数,而在前一种情况下,一个常数接近。

英文摘要:

We extend recent results on expectation values of coherent oscillator states and SU(2) coherent states to the case of the discrete representations of su(1,1). Systematic semiclassical expansions of products of arbitrary operators are derived. In particular, the leading order of the energy uncertainty of an arbitrary Hamiltonian is found to be given purely in terms of the time dependence of the classical variables. The coherent states considered here include the Perelomov-Gilmore coherent states. As an important application we discuss the pseudoharmonic oscillator and compare the Perelomov-Gilmore states with the states introduced by Barut and Girardello. The latter ones turn out to be closer to the classical limit as their relative energy variance decays with the inverse square root of energy, while in the former case a constant is approached.

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