arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.00290nlin.SImath-phmath.APmath.MP
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具有非零边界条件的修正矩阵Korteweg-de Vries方程的逆散射变换和孤子解

Inverse scattering transform and soliton solutions for the modified matrix Korteweg-de Vries equation with nonzero boundary conditions

Jin-Jie Yang, Shou-Fu Tian, Zhi-Qiang Li

摘要:

利用逆散射理论研究了无穷远点非零边界条件下具有$2m\times2m$ $(m\geq 1)$拉克斯对对的修正矩阵Korteweg-de Vries(mmKdV)方程的初值问题.在正问题中,通过引入适当的一致变换,我们建立了适当的复$z$平面,讨论了方程的Jost本征函数、散射矩阵及其解析性和对称性。通过Wentzel-Kramers-Brillouin展开,分析了反问题所需的Jost函数和散射矩阵的渐近性质。在反问题中,首先利用修正的本征函数和散射系数的解析性建立了mmKdV方程的广义Riemann-Hilbert问题.通过求解这个Riemann-Hilbert问题,利用散射数据,导出了无反射情况下势函数的重构公式。此外,在势为标量和对称矩阵为$2\times2$的条件下,详细讨论了聚焦mmKdV方程的单孤子解和双孤子解的动力学行为。最后,我们给出了一些详细的证明和弱形式的迹公式来说明势和散射数据的渐近相位。

英文摘要:

The theory of inverse scattering is developed to study the initial-value problem for the modified matrix Korteweg-de Vries (mmKdV) equation with the $2m\times2m$ $(m\geq 1)$ Lax pairs under the nonzero boundary conditions at infinity. In the direct problem, by introducing a suitable uniform transformation we establish the proper complex $z$-plane in order to discuss the Jost eigenfunctions, scattering matrix and their analyticity and symmetry of the equation. Moreover the asymptotic behavior of the Jost functions and scattering matrix needed in the inverse problem are analyzed via Wentzel-Kramers-Brillouin expansion. In the inverse problem, the generalized Riemann-Hilbert problem of the mmKdV equation is first established by using the analyticity of the modified eigenfunctions and scattering coefficients. The reconstruction formula of potential function with reflection-less case is derived by solving this Riemann-Hilbert problem and using the scattering data. In addition the dynamic behavior of the solutions for the focusing mmKdV equation including one- and two- soliton solutions are presented in detail under the the condition that the potential is scalar and the $2\times2$ symmetric matrix. Finally, we provide some detailed proofs and weak version of trace formulas to show that the asymptotic phase of the potential and the scattering data.

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