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arXiv 1011.2176hep-thmath-phmath.MPnlin.SI
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拟可积性概念的一个具体例子

The concept of quasi-integrability: a concrete example

L. A. Ferreira, Wojtek J. Zakrzewski

摘要:

我们使用Bazeia等人最近提出的变形sine-Gordon模型来讨论准可积性的可能定义。我们提出了一个这样的定义,并使用它来计算一个无限数量的准守恒量,通过修改的可积场论的通常技术。围绕正弦-戈登理论进行扩展,我们能够在一个小参数的微扰幂级数中评估电荷及其守恒律的异常,该参数描述了可积正弦-戈登模型的“接近性”。我们的结果表明,在两个孤子散射的情况下,电荷是渐近守恒的,即它们的值在遥远的过去和未来是相同的,当孤子是很好的分离。我们支持我们的结果与数值模拟,这也证明了在这些模型中存在长寿命的呼吸和摆动状态。

英文摘要:

We use the deformed sine-Gordon models recently presented by Bazeia et al to discuss possible definitions of quasi-integrability. We present one such definition and use it to calculate an infinite number of quasi-conserved quantities through a modification of the usual techniques of integrable field theories. Performing an expansion around the sine-Gordon theory we are able to evaluate the charges and the anomalies of their conservation laws in a perturbative power series in a small parameter which describes the "closeness" to the integrable sine-Gordon model. Our results indicate that in the case of the two-soliton scattering the charges are conserved asymptotically, i.e. their values are the same in the distant past and future, when the solitons are well separated. We back up our results with numerical simulations which also demonstrate the existence of long lived breather-like and wobble-like states in these models.

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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