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arXiv quant-ph/0402049quant-ph
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相互作用玻色子模型相变的准动力学对称性

Quasi dynamical symmetry in an interacting boson model phase transition

David J. Rowe

摘要:

在SO(5)不变相互作用玻色子模型中,研究了在强破缺相互作用下经常观察到的对称性的持续性。当控制参数的值从0到1时,该模型表现出分别与U(5)和O(6)对称性相关联的两个阶段之间的转变。值得注意的事实是,对于控制参数的中间值,模型状态表现出其最接近的对称极限的特性,但相对较窄的过渡区,随着模型的粒子数的增加而逐渐变窄。这一现象可以用准动力学对称性来解释。

英文摘要:

The oft-observed persistence of symmetry properties in the face of strong symmetry-breaking interactions is examined in the SO(5)-invariant interacting boson model. This model exhibits a transition between two phases associated with U(5) and O(6) symmetries, respectively, as the value of a control parameter progresses from 0 to 1. The remarkable fact is that, for intermediate values of the control parameter, the model states exhibit the characteristics of its closest symmetry limit for all but a relatively narrow transition region that becomes progressively narrower as the particle number of the model increases. This phenomenon is explained in terms of quasi-dynamical symmetry.

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