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arXiv 1909.04205gr-qchep-phhep-th
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引力磁单极子稳定吗?

Are gravitating magnetic monopoles stable?

Ben Kain

摘要:

引力作用下的Julia-Zee双子是一种具有电荷和磁荷的粒子状溶液。它存在于SU(2)的Einstein-Yang-Mills-Higgs系统中,该系统具有与引力耦合的伴随表象中的标量场。在磁偶子中,这个系统从描述双子简化为描述引力作用下的t Hooft-Polyakov磁偶子。众所周知的静态引力磁扰动解相对于磁扰动内的扰动--所谓的磁扰动--的稳定性得到了很好的研究,但是它们相对于磁扰动外的扰动--所谓的球扰动--的稳定性却没有得到很好的研究。我进行了一个纯粹的数值研究,通过添加sphaleronic扰动的引力磁扰动的解决方案,然后动态发展的系统。对于大的扰动,我发现系统的头朝着双子配置,正如预期的那样。然而,对于足够小的扰动,系统以与关于稳定平衡的振荡一致的方式围绕磁平衡振荡。

英文摘要:

The gravitating Julia-Zee dyon is a particle-like solution with both electric and magnetic charge. It is found in the Einstein-Yang-Mills-Higgs system of SU(2) with a scalar field in the adjoint representation coupled to gravity. Within the magnetic ansatz this system is reduced from describing dyons to describing the gravitating 't Hooft-Polyakov magnetic monopole. The stability of the well-known static gravitating magnetic monopole solutions with respect to perturbations within the magnetic ansatz--so-called magnetic perturbations--is well studied, but their stability with respect to perturbations outside the magnetic ansatz--so-called sphaleronic perturbations--is not. I undertake a purely numerical study by adding sphaleronic perturbations to gravitating magnetic monopole solutions and then dynamically evolving the system. For large perturbations I find that the system heads toward a dyon configuration, as expected. For sufficiently small perturbations, however, the system oscillates about the magnetic ansatz in a manner consistent with oscillations about a stable equilibrium.

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