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arXiv 2009.01013math-phhep-thmath.MPnlin.SI
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离散时间可积性的代数方法

An algebraic approach to discrete time integrability

Anastasia Doikou, Iain Findlay

摘要:

我们提出的经典和量子二维时空晶格的系统建设主要基于代数的考虑,即相关的r-矩阵和潜在的空间和时间的经典和量子代数的存在。这是一个新的建设,导致推导出完全离散的可积系统由一组一致的可积非线性时空差分方程。为了说明所提出的方法,我们推导出两个版本的完全离散的非线性薛定谔型系统。第一个是基于一个合理的r-矩阵的存在,而第二个是完全离散的Ablowitz-Ladik模型,并与三角r-矩阵。达布敷料的方法也适用于第一个离散化计划,主要是作为一个一致性检查,以及孤子和一般的解决方案,在完全离散的热方程的解决方案,也来自。在这种情况下,完全离散系统的量子化是很自然的,因此也研究了二维量子晶格。

英文摘要:

We propose the systematic construction of classical and quantum two dimensional space-time lattices primarily based on algebraic considerations, i.e. on the existence of associated r-matrices and underlying spatial and temporal classical and quantum algebras. This is a novel construction that leads to the derivation of fully discrete integrable systems governed by sets of consistent integrable non-linear space-time difference equations. To illustrate the proposed methodology, we derive two versions of the fully discrete non-linear Schrodinger type system. The first one is based on the existence of a rational r-matrix, whereas the second one is the fully discrete Ablowitz-Ladik model and is associated to a trigonometric r-matrix. The Darboux-dressing method is also applied for the first discretization scheme, mostly as a consistency check, and solitonic as well as general solutions, in terms of solutions of the fully discrete heat equation, are also derived. The quantization of the fully discrete systems is then quite natural in this context and the two dimensional quantum lattice is thus also examined.

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