arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.09523math.AP
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$ϕ^4$ -模型周期波解的轨道稳定性和不稳定性

Orbital stability and instability of periodic wave solutions for the $ϕ^4$-model

José Manuel Palacios

摘要:

在这项工作中,我们找到了经典的$ϕ^4$ -模型的显式周期波解,并研究了它们在能量空间中相应的轨道稳定性/不稳定性。特别是,对于这个模型,我们发现至少有四个不同的分支的空间周期波的解决方案,这可以写在雅可比椭圆函数。其中两个分支对应于超光速波,第三个分支对应于亚光速波,剩下的一个分支对应于稳态复值波。在这项工作中,我们证明了轨道不稳定性的实值亚光速行波和稳态复值波。此外,我们证明了在一些额外的假设下,零速亚光速的情况是稳定的。后一种情况(在某种意义上)与经典的扭结解有关。

英文摘要:

In this work we find explicit periodic wave solutions for the classical $ϕ^4$-model, and study their corresponding orbital stability/instability in the energy space. In particular, for this model we find at least four different branches of spatially-periodic wave solutions, which can be written in terms of Jacobi elliptic functions. Two of these branches correspond to superluminal waves, a third-one corresponding to a sub-luminal wave and the remaining one corresponding to a stationary complex-valued wave. In this work we prove the orbital instability of both, real-valued sub-luminal traveling waves and stationary complex-valued waves. Furthermore, we prove that under some additional hypothesis the zero-speed sub-luminal case is stable. This latter case is related (in some sense) to the classical Kink solution.

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