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arXiv 2102.12134hep-th
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具有高斯尾的近BPS婴儿Skyrmions

Near-BPS baby Skyrmions with Gaussian tails

Sven Bjarke Gudnason, Marco Barsanti, Stefano Bolognesi

摘要:

我们考虑婴儿Skyrme模型在一个物理激励的限制,达到限制或BPS婴儿Skyrme模型,这是一个模型,享有面积保持同态不变性。微扰由动力学狄利克雷项和标准π介子质量项组成,前者的系数为小$ε$,后者的系数为$εm_1^2$。对于任何$ε$,π介子仍然比孤子轻,因此即使在$ε\to 0$极限下,该模型在物理上也是可以接受的。我们使用的BPS婴儿Skyrme模型的版本具有带高斯尾部的BPS解。我们进行充分的数值计算的$ε\to 0$限制,甚至达到严格的$ε=0$的情况下,找到新的非平凡的BPS解决方案,我们还不知道的解析形式。

英文摘要:

We consider the baby Skyrme model in a physically motivated limit of reaching the restricted or BPS baby Skyrme model, which is a model that enjoys area-preserving diffeomorphism invariance. The perturbation consists of the kinetic Dirichlet term with a small coefficient $ε$ as well as the standard pion mass term, with coefficient $εm_1^2$. The pions remain lighter than the soliton for any $ε$ and therefore the model is physically acceptable, even in the $ε\to 0$ limit. The version of the BPS baby Skyrme model we use has BPS solutions with Gaussian tails. We perform full numerical computations in the $ε\to 0$ limit and even reach the strict $ε=0$ case, finding new nontrivial BPS solutions, for which we do not yet know the analytic form.

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