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arXiv 1208.2465hep-thmath-phmath.MP
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矢量BPS Skyrme模型

The vector BPS Skyrme model

C. Adam, C. Naya, J. Sanchez-Guillen, A. Wereszczynski

摘要:

我们分析了(3+1)维BPS Skyrme模型的矢量介子公式,其中的第六次幂项的原始的,可积的BPS Skyrme模型(拓扑或重子流平方)的一阶导数特性被替换为矢量介子$ω_μ$和重子流之间的耦合。我们发现,该模型仍然是可积的广义可积性和几乎可解的(可约为一组两个一阶常微分方程)的重子电荷的任何值的意义。进一步,我们分析了两个单参数单真空势族:旧Skyrme势和所谓的BPS势的拓扑孤子的出现。根据参数的值,我们发现几个定性不同的可能性。在无质量的情况下,我们有一个参数区域没有skyrmion,一个独特的紧凑skyrmion与不连续的一阶导数在边界(相当于,与源项位于边界,屏幕的拓扑电荷),和库仑局域孤子。对于大质量矢量介子,除了非skyrmion区域和唯一的C紧孤子外,我们还发现了指数和幂次局域skyrmion。此外,我们发现(对于特定的潜在)BPS解决方案,即,饱和Bogomolny束缚(无质量和有质量矢量介子)的skyrmions,对于重子电荷的较高值是不稳定的。最后,该模型的性质进行了比较,它的婴儿版本在(2+1)维,并与原来的BPS Skyrme模型,有助于更好地理解后者。

英文摘要:

We analyze the vector meson formulation of the BPS Skyrme model in (3+1) dimensions, where the term of sixth power in first derivatives characteristic for the original, integrable BPS Skyrme model (the topological or baryon current squared) is replaced by a coupling between the vector meson $ω_μ$ and the baryon current. We find that the model remains integrable in the sense of generalized integrability and almost solvable (reducible to a set of two first order ODEs) for any value of the baryon charge. Further, we analyze the appearance of topological solitons for two one-parameter families of one vacuum potentials: the old Skyrme potentials and the so-called BPS potentials. Depending on the value of the parameters we find several qualitatively different possibilities. In the massless case we have a parameter region with no skyrmions, a unique compact skyrmion with a discontinuous first derivative at the boundary (equivalently, with a source term located at the boundary, which screens the topological charge), and Coulomb-like localized solitons. For the massive vector meson, besides the no-skyrmion region and a unique C-compact soliton, we find exponentially as well as power-like localized skyrmions. Further, we find (for a specific potential) BPS solutions, i.e., skyrmions saturating a Bogomolny bound (both for the massless and massive vector mesons) which are unstable for higher values of the baryon charge. The properties of the model are finally compared with its baby version in (2+1) dimensions, and with the original BPS Skyrme model, contributing to a better understanding of the latter.

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