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arXiv 2307.08196nlin.SImath.AP
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直线上 Sawada-Kotera 方程与 Kaup-Kupershmidt 方程的长时间渐近性

Long-time asymptotics of the Sawada-Kotera equation and Kaup-Kupershmidt equation on the line

Deng-Shan Wang, Xiaodong Zhu

AI总结:

本文利用正、逆散射变换构造 SK、KK 及修正 SK-KK 方程的 Riemann-Hilbert 问题,并以 Deift-Zhou 最速下降法分析其长时间渐近性,数值模拟验证了渐近解。

摘要:

Sawada-Kotera(SK)方程和 Kaup-Kupershmidt(KK)方程都是具有三阶 Lax 算子的可积系统。此外,它们通过 Miura 变换与同一个修正非线性方程(称为修正 SK-KK 方程)相关联。本工作首先利用正散射变换和逆散射变换,构造了与 SK 方程、KK 方程及修正 SK-KK 方程相关的 Riemann-Hilbert 问题。随后,基于用于 Riemann-Hilbert 问题的 Deift-Zhou 最速下降法,研究了这些方程的长时间渐近性。最后表明,渐近解与直接数值模拟结果吻合得非常好。

英文摘要:

Both Sawada-Kotera (SK) equation and Kaup-Kupershmidt (KK) equation are integrable systems with third-order Lax operator. Moreover, they are related with the same modified nonlinear equation (called modified SK-KK equation) by Miura transformations. This work first constructs the Riemann-Hilbert problem associated with the SK equation, KK equation and modified SK-KK equation by direct and inverse scattering transforms. Then the long-time asymptotics of these equations are studied based on Deift-Zhou steepest-descent method for Riemann-Hilbert problem. Finally, it is shown that the asymptotic solutions match very well with the results of direct numerical simulations.

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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