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arXiv quant-ph/9608016quant-ph
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求解一类量子非线性模型的$sl(2)$变分格式

$sl(2)$ variational schemes for solving one class of quantum nonlinear models

V. P. Karassiov

摘要:

广泛存在的一类$G_{inv}$不变的非线性量子模型,包括多玻色子和频率转换模型,其哈密顿量被表示为$sl(2)$生成元的非线性函数.它使我们能够使用标准的变分方案,基于$sl(2)$广义相干态作为试验函数,解决光谱和演化任务。以这种方式,一个新的解析表达式被发现的能量谱的平均场近似,这是超越了准等距的前面得到的。

英文摘要:

Hamiltonians of a wide-spread class of $G_{inv}$-invariant nonlinear quantum models, including multiboson and frequency conversion ones, are expressed as non-linear functions of $sl(2)$ generators. It enables us to use standard variational schemes, based on $sl(2)$ generalized coherent states as trial functions, for solving both spectral and evolution tasks. In such a manner a new analytical expression is found for energy spectra in a mean-field approximation which is beyond quasi-equidistant ones obtained earlier.

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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