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Exact and non-exact Fermi-Pasta-Ulam-Tsingou recurrences in a Heisenberg ferromagnet

机译:在Heisenberg Ferromagnet中确切和非精确的费米 - 乌拉姆 - Tsongou复发

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摘要

We visualize the Fermi-Pasta-Ulam-Tsingou (FPUT) recurrence in a classical Heisenberg ferromagnetic (HF) spin chain by exploiting its gauge equivalence to the nonlinear Schrodinger equation (NLSE). We discuss two types of spatially periodic breather excitations in the spin chain, that are associated with: (I) Akhmediev breather (AB), and (II) Galilean transformed AB. The recurrence in the former is exact in the sense that the initial and final states are identical. In the later, the spin chain undergoes an additional global rotation during the recurrence process, which makes the initial and final states distinguishable. Both the complex solutions (I) and (II) nevertheless show a definite phase shift during the recurrence process. A one-to-one correspondence between HF spin chain and the NLSE seems missing by virtue of the closeness of the FPUT recurrence.
机译:我们通过利用其向非线性Schrodinger方程(NLSE)的规格等量来使Fermi-Pasta-Ulam-Tsingou(HF)旋转链中的Fermi-Pasta-Ulam-Tsingou(Fpput)复发。 我们讨论了旋转链中的两种类型的空间周期性呼吸激动,与:(i)akhmediev呼吸器(ab)和(ii)Gallilean转化Ab。 前者的再次发生是精确的,即最初和最终状态是相同的。 在后来,旋转链在复发过程中经历了另外的全局旋转,这使得最初和最终状态可区分。 复杂解决方案(I)和(II)既不明确在复发过程中显示出明确的相移。 凭借复发复发的近似,HF旋转链和NLSE之间的一对一对应似乎缺失。

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