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arXiv 2108.08694hep-thmath-phmath.MP
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高维广义Skyrme模型的BPS Skyrmions

BPS Skyrmions of Generalized Skyrme Model In Higher Dimensions

Emir Syahreza Fadhilla, Bobby Eka Gunara, Ardian Nata Atmaja

摘要:

在这项工作中,我们考虑了更高的维Skyrme模型,空间维度$d > 3$,专注于它的BPS子模型及其相应的功能。为了适应具有更高拓扑度\(B\geq 1\)的情况,使用修改的广义刺猬模型,其中我们为每个旋转平面分配整数\(n_i\),导致与这些整数的乘积成比例的拓扑度。通过BPS拉格朗日方法发现,这种球对称模型只有两种可能的BPS子模型,即BPS Skyrme模型和标度不变模型。研究了这两个子模型的高维性质,发现在第一个子模型中存在具有\(B\geq1\)的BPS Skyrmion,而在第二个子模型中只有\(B=1\) BPS Skyrmion.我们还研究了应变张量本征值的自对偶条件的高维版本,并发现,在一般情况下,标度不变模型比BPS Skyrme模型具有更强的自对偶条件。

英文摘要:

In this work we consider the higher dimensional Skyrme model, with spatial dimension $d > 3$, focusing on its BPS submodels and their corresponding features. To accommodate the cases with a higher topological degree, \(B\geq 1\), a modified generalized hedgehog ansatz is used where we assign an integer \(n_i\) for each rotational plane, resulting in a topological degree that proportional to product of these integers. It is found via BPS Lagrangian method that there are only two possible BPS submodels for this spherically symmetric ansatz which shall be called as BPS Skyrme model and scale-invariant model. The properties of the higher dimensional version of both submodels are studied and it is found that the BPS Skyrmions with \(B\geq1\) exist in the first submodel but there is only \(B=1\) BPS Skyrmion in the second submodel. We also study the higher dimensional version of self-duality conditions in terms of strain tensor eigenvalues and find that, in general, the scale-invariant model has a stronger self-duality condition than the BPS Skyrme model.

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