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arXiv 1203.2677nlin.SImath-phmath.MP
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关于约化Ostrovsky方程和$A_2^{(2)}$二维Toda系统的$τ$ -函数

On the $τ$-functions of the reduced Ostrovsky equation and the $A_2^{(2)}$ two-dimensional Toda system

Bao-Feng Feng, Ken-ichi Maruno, Yasuhiro Ohta

摘要:

利用约化Ostrovsky方程与$A_2^{(2)}$二维Toda系统之间的相互联系,构造了约化Ostrovsky方程的$N$ -孤子解.通过速度图(倒数)变换,给出了约化Ostrovsky方程的$N$ -孤子解.由$B_{\infty}$或$C_{\infty}$二维Toda系统的周期3-约化得到约化Ostrovsky方程的双线性方程和$τ$ -函数,即,$A_2^{(2)}$二维Toda系统。$A_2^{(2)}$二维Toda系统的一个$τ$函数变成了一个pf函数的平方,这个pf函数也变成了约化Ostrovsky方程的解。存在另一个双线性方程,它是3-约化的扩展BKP族的成员。利用这个双线性方程,我们也可以构造出同样的pfronan解。

英文摘要:

The reciprocal link between the reduced Ostrovsky equation and the $A_2^{(2)}$ two-dimensional Toda system is used to construct the $N$-soliton solution of the reduced Ostrovsky equation. The $N$-soliton solution of the reduced Ostrovsky equation is presented in the form of pfaffian through a hodograph (reciprocal) transformation. The bilinear equations and the $τ$-function of the reduced Ostrovsky equation are obtained from the period 3-reduction of the $B_{\infty}$ or $C_{\infty}$ two-dimensional Toda system, i.e., the $A_2^{(2)}$ two-dimensional Toda system. One of $τ$-functions of the $A_2^{(2)}$ two-dimensional Toda system becomes the square of a pfaffian which also become a solution of the reduced Ostrovsky equation. There is another bilinear equation which is a member of the 3-reduced extended BKP hierarchy. Using this bilinear equation, we can also construct the same pfaffian solution.

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