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arXiv 2101.02520nlin.SImath-phmath.MP
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用玻色-费米子对应实现达布变换中的双线性方程

Bilinear equations in Darboux transformations by Boson-Fermion correspondence

Yi Yang, Jipeng Cheng

摘要:

双线性方程是可积非线性发展方程的一个重要性质。数学物理中许多著名的研究对象,如Gromov-Witten不变量,都可以用双线性方程来描述,以表明它们与可积系统的联系。本文主要利用玻色-费米子对应的方法,讨论KP族、修正KP族(Kupershmidt-Kiso版本)和BKP族的变换τ函数在连续应用达布变换下的双线性方程.在费米子图像中考虑了达布变换,通过将不同的费米子场乘以τ函数。这里的费米场对应于(伴随)本征函数,其在达布变换下的变化被证明是玻色图像中本征函数势的平方,用于(伴随)本征函数的谱表示。然后给出了达布变换在费米子图象中的连续应用。在此基础上,除$(l-l')$阶修正KP族的双线性方程外,还导出了Darboux链上的一些新的双线性方程.给出了这些新的双线性方程的相应例子。

英文摘要:

Bilinear equation is an important property for integrable nonlinear evolution equation. Many famous research objects in mathematical physics, such as Gromov-Witten invariants, can be described in terms of bilinear equations to show their connections with the integrable systems. Here in this paper, we mainly discuss the bilinear equations of the transformed tau functions under the successive applications of the Darboux transformations for the KP hierarchy, the modified KP hierarchy (Kupershmidt-Kiso version) and the BKP hierarchy, by the method of the Boson-Fermion correspondence. The Darboux transformations are considered in the Fermionic picture, by multiplying the different Fermionic fields on the tau functions. Here the Fermionic fields are corresponding to the (adjoint) eigenfunctions, whose changes under the Darboux transformations are showed to be the ones of the squared eigenfunction potentials in the Bosonic picture, used in the spectral representations of the (adjoint) eigenfunctions. Then the successive applications of the Darboux transformations are given in the Fermionic picture. Based upon this, some new bilinear equations in the Darboux chain are derived, besides the ones of $(l-l')$ -th modified KP hierarchy. The corresponding examples of these new bilinear equations are given.

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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