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arXiv 2110.06239math-phhep-thmath.MPnlin.SI
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非手征中间体Heisenberg铁磁体方程

The non-chiral intermediate Heisenberg ferromagnet equation

Bjorn K. Berntson, Rob Klabbers, Edwin Langmann

摘要:

我们提出并求解了一个孤子方程,我们称之为非手征中间体海森堡铁磁体(ncIHF)方程。该方程依赖于一个参数$δ>0$,描述了两个耦合自旋密度在实数线上传播的时间演化,在极限$δ\to \infty$下,它简化为两个手征相反的解耦半波映射(HWM)方程。我们证明了ncIHF方程与A型双曲自旋Calogero-Moser(CM)系统以两种不同的方式相关:(i)它是作为与该CM系统相关的Inozemtsev型自旋链的特定连续极限获得的,(ii)它具有多孤立子解通过自旋极点假设获得,并且参数满足该CM系统的复杂版本的运动方程。通过构造一个拉克斯对,证明了ncIHF方程的可积性.我们还提出了一个周期性的变种ncIHF方程相关的A-型椭圆自旋CM系统。

英文摘要:

We present and solve a soliton equation which we call the non-chiral intermediate Heisenberg ferromagnet (ncIHF) equation. This equation, which depends on a parameter $δ>0$, describes the time evolution of two coupled spin densities propagating on the real line, and in the limit $δ\to \infty$ it reduces to two decoupled half-wave maps (HWM) equations of opposite chirality. We show that the ncIHF equation is related to the A-type hyperbolic spin Calogero-Moser (CM) system in two distinct ways: (i) it is obtained as a particular continuum limit of a Inozemtsev-type spin chain related to this CM system, (ii) it has multi-soliton solutions obtained by a spin-pole ansatz and with parameters satisfying the equations of motion of a complexified version of this CM system. The integrability of the ncIHF equation is shown by constructing a Lax pair. We also propose a periodic variant of the ncIHF equation related to the A-type elliptic spin CM system.

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