单位圆上的正交Laurent多项式、推广的CMV序和二维Toda型可积族
Orthogonal Laurent polynomials in unit circle, extended CMV ordering and 2D Toda type integrable hierarchies
摘要：
利用支持在单位圆上的复拟定测度构造的Cantero-Moral-Velazquez矩矩阵的Gauss-Borel分解，将单位圆上的正交Laurent多项式与Toda-like可积系统理论联系起来.通过矩量矩阵的因式分解，得到了单位圆内的正交Laurent多项式和相应的第二类函数。在这个观点下，以完全代数的方法得到了Jacobi算子、5项递归关系和投影到特定截断Laurent多项式空间的Christoffel-Darboux核以及相应的Christoffel-Darboux公式.推广了Laurent单项式的Cantero-Moral-Velazquez序列，并在此基础上得到了递归关系、Christoffel-Darboux核、投影到一般截断Laurent多项式空间的关系以及相应的Christoffel-Darboux公式.连续变形的时刻矩阵的介绍，并示出它们如何诱导一个依赖于时间的正交性问题有关的Toda型可积系统，这是众所周知的Toeplitz格。利用经典的可积性理论工具得到了Lax方程和Zakharov-Shabat方程。明确地导出了与正交Laurent多项式的系数相关联的动力系统，并与经典的Toeplitz格动力系统在正测度下的SzegIgn多项式的Verblunsky系数进行了比较.离散流的介绍和达布变换。最后，利用Miwa移位的形式，给出了正交Laurent多项式（及其第二类函数）的$τ$ -函数表示，并导出了双线性方程.
英文摘要：
Orthogonal Laurent polynomials in the unit circle and the theory of Toda-like integrable systems are connected using the Gauss--Borel factorization of a Cantero-Moral-Velazquez moment matrix, which is constructed in terms of a complex quasi-definite measure supported in the unit circle. The factorization of the moment matrix leads to orthogonal Laurent polynomials in the unit circle and the corresponding second kind functions. Jacobi operators, 5-term recursion relations and Christoffel-Darboux kernels, projecting to particular spaces of truncated Laurent polynomials, and corresponding Christoffel-Darboux formulae are obtained within this point of view in a completely algebraic way. Cantero-Moral-Velazquez sequence of Laurent monomials is generalized and recursion relations, Christoffel-Darboux kernels, projecting to general spaces of truncated Laurent polynomials and corresponding Christoffel-Darboux formulae are found in this extended context. Continuous deformations of the moment matrix are introduced and is shown how they induce a time dependant orthogonality problem related to a Toda-type integrable system, which is connected with the well known Toeplitz lattice. Using the classical integrability theory tools the Lax and Zakharov-Shabat equations are obtained. The dynamical system associated with the coefficients of the orthogonal Laurent polynomials is explicitly derived and compared with the classical Toeplitz lattice dynamical system for the Verblunsky coefficients of Szegő polynomials for a positive measure. Discrete flows are introduced and related to Darboux transformations. Finally, the representation of the orthogonal Laurent polynomials (and its second kind functions), using the formalism of Miwa shifts, in terms of $τ$-functions is presented and bilinear equations are derived.
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。
