PreHamiltonian and Hamiltonian operators for differential-difference equations

PreHamiltonian and Hamiltonian operators for differential-difference equations
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微分差分方程的前哈密顿算子和哈密顿算子

DOI:
10.1088/1361-6544/ab5912
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发表时间:
2020
期刊:
影响因子:
1.7
通讯作者:
Carpentier S
Carpentier S
中科院分区:
数学2区
文献类型:
--
作者:
Carpentier S

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在本文中,我们正在发展一种有理(伪)差分哈密顿算子理论,特别关注其代数方面。我们证明,伪差分哈密顿算子可以表示为两个差分算子的比率 AB−1,其系数来自差分域,其中 A 是前哈密顿算子。如果差分算子 A 的图像是关于演化向量场的李括号的李子代数,则称为前哈密尔顿算子。有理哈密顿算子的定义可以根据其因子重新表述,这简化了理论并使其适用于应用。特别地,我们表明,对于给定的有理哈密顿算子 H,为了找到与 H 兼容的第二个哈密顿算子 K,只需找到一对前哈密顿算子 A 和 B,使得 K= AB− 1 H 是斜对称的。我们应用我们的理论来研究 Narita-Itoh-Bogayavlensky 和 ​​Adler-Postnikov 方程的多重哈密顿结构。
In this paper we are developing a theory of rational (pseudo) difference Hamiltonian operators, focusing in particular on its algebraic aspects. We show that a pseudo-difference Hamiltonian operator can be represented as a ratio AB− 1 of two difference operators with coefficients from a difference field, where A is preHamiltonian. A difference operator A is called preHamiltonian if its image is a Lie subalgebra with respect to the Lie bracket of evolutionary vector fields on. The definition of a rational Hamiltonian operator can be reformulated in terms of its factors which simplifies the theory and makes it useful for applications. In particular we show that for a given rational Hamiltonian operator H in order to find a second Hamiltonian operator K compatible with H one only needs to find a preHamiltonian pair A and B such that K= AB− 1 H is skew-symmetric. We apply our theory to study multi-Hamiltonian structures of Narita–Itoh–Bogayavlensky and Adler–Postnikov equations.
DOI: 10.1093/imrn/rny242
发表时间: 2018
影响因子: 1
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