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arXiv 2012.03336math.APcs.NAmath.NA
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广义Benjamin-Ono方程解的动力学性质:数值研究

Dynamics of solutions in the generalized Benjamin-Ono equation: a numerical study

Svetlana Roudenko, Zhongming Wang, Kai Yang

摘要:

考虑了广义Benjamin-Ono(gBO)方程$ u_t + \partial_x (-\mathcal H u_{x} + \tfrac1{m} u^m) = 0, x \in \mathbb R, m = 2,3,4,5$,并对其解进行了数值研究.我们首先通过Petviashvili的迭代法计算$-Q -\mathcal H Q^\prime +\frac1{m} Q^m = 0$的基态解。然后,我们调查的Benjamin-Ono($m=2$)方程的初始数据与不同的衰减率的解决方案的行为,并显示解去耦成孤子和辐射,从而,提供了该方程中的孤子分辨率猜想的确认。在具有$L^2$临界的mBO方程($m=3$)中,我们研究了接近基态质量的解,特别地,我们观察到在基态质量之上稳定爆破的形成。最后,我们重点研究了具有$m=4,5$的$L^2$ -超临界gBO方程。在这种情况下,我们调查的整体与有限时间的存在性的解决方案,并给出数值证实的二分法猜想,特别是,展示爆破现象在超临界设置。

英文摘要:

We consider the generalized Benjamin-Ono (gBO) equation on the real line, $ u_t + \partial_x (-\mathcal H u_{x} + \tfrac1{m} u^m) = 0, x \in \mathbb R, m = 2,3,4,5$, and perform numerical study of its solutions. We first compute the ground state solution to $-Q -\mathcal H Q^\prime +\frac1{m} Q^m = 0$ via Petviashvili's iteration method. We then investigate the behavior of solutions in the Benjamin-Ono ($m=2$) equation for initial data with different decay rates and show decoupling of the solution into a soliton and radiation, thus, providing confirmation to the soliton resolution conjecture in that equation. In the mBO equation ($m=3$), which is $L^2$-critical, we investigate solutions close to the ground state mass, and, in particular, we observe the formation of stable blow-up above it. Finally, we focus on the $L^2$-supercritical gBO equation with $m=4,5$. In that case we investigate the global vs finite time existence of solutions, and give numerical confirmation for the dichotomy conjecture, in particular, exhibiting blow-up phenomena in the supercritical setting.

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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