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arXiv 2108.06284math.APmath-phmath.MP
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关于具有有限密度初值的散焦mKdV方程的Cauchy问题:无孤子区域中的长时间渐近性

On the Cauchy problem of defocusing mKdV equation with finite density initial data: long time asymptotics in soliton-less regions

Taiyang Xu, Zechuan Zhang, Engui Fan

AI总结:

本文利用Riemann-Hilbert方法研究具有有限密度初值的散焦mKdV方程在无孤子区域中的长时间渐近性,证明主项与背景解相容并给出误差估计。

摘要:

我们研究具有有限密度初值的散焦修正Korteweg-de Vries(mKdV)方程Cauchy问题解的长时间渐近性。本文是我们先前工作[arXiv:2108.03650]的后续研究,该工作给出了中心渐近区域$\{(x,t): \vert ξ\vert<6\}$(其中$ξ:=x/t$)中散焦mKdV方程的孤子分解。本文通过与该Cauchy问题相关的Riemann-Hilbert(RH)问题,进一步得到了散焦mKdV方程在无孤子区域$\{(x,t): \vert ξ\vert>6, |ξ|=\mathcal{O}(1)\}$中的长时间渐近性。结果表明,渐近展开的主项与“背景解”相容,误差项通过严格分析导出。

英文摘要:

We investigate the long-time asymptotics for the solutions to the Cauchy problem of defocusing modified Kortweg-de Vries (mKdV) equation with finite density initial data. The present paper is the subsequent work of our previous paper [arXiv:2108.03650], which gives the soliton resolution for the defocusing mKdV equation in the central asymptotic sector $\{(x,t): \vert ξ\vert<6\}$ with $ξ:=x/t$. In the present paper, via the Riemann-Hilbert (RH) problem associated to the Cauchy problem, the long-time asymptotics in the soliton-less regions $\{(x,t): \vert ξ\vert>6, |ξ|=\mathcal{O}(1)\}$ for the defocusing mKdV equation are further obtained. It is shown that the leading term of the asymptotics are in compatible with the ``background solution'' and the error terms are derived via rigorous analysis.

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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