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arXiv 2103.04908hep-thnlin.PS
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摆动双正弦-戈登扭结

Wobbling double sine-Gordon kinks

João G. F. Campos, Azadeh Mohammadi

摘要:

研究了双sine-Gordon模型中有无激发振动模时的扭折与反扭折碰撞。在后一种情况下,我们发现,有一个有限的范围内的共振窗口存在的参数,尽管存在的振动模式。尽管如此,当振动模式最初被激发时,它的能量在碰撞后可以转化为平移能。这产生了一次反弹以及更高反弹共振窗口的丰富结构,其取决于在碰撞处同相或异相的摆动相位以及足够大的摆动幅度。当振动模式被激发时,在整个模型参数范围内都观察到单反射窗的修正结构,高反射窗的共振间隔随着摆动幅度的增大而逐渐增大。我们估计的中心的一个反弹窗口使用一个简单的分析近似的摆动的演变。扭结的最终摆动频率是洛伦兹收缩的,这是简单地从我们的方程推导出来的。我们还报告说,最大能量密度值总是有一个平稳的行为在共振窗口。

英文摘要:

We study the collision of a kink and an antikink in the double sine-Gordon model with and without the excited vibrational mode. In the latter case, we find that there is a limited range of the parameters where the resonance windows exist, despite the existence of a vibrational mode. Still, when the vibrational mode is initially excited, its energy can turn into translational energy after the collision. This creates one-bounce as well as a rich structure of higher-bounce resonance windows that depend on the wobbling phase being in or out of phase at the collision and the wobbling amplitude being sufficiently large. When the vibrational mode is excited, the modified structure of one-bounce windows is observed in the whole range of the model's parameters, and the resonant interval with higher-bounce windows gradually increases with the wobbling amplitude. We estimated the center of the one-bounce windows using a simple analytical approximation for the wobbling evolution. The kinks' final wobbling frequency is Lorentz contracted, which is simply derived from our equations. We also report that the maximum energy density value always has a smooth behavior in the resonance windows.

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