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arXiv 0901.4136hep-th
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无质量星云的相互作用

Interactions of massless monopole clouds

Christopher M. Miller, Erick J. Weinberg

摘要:

一些自发破缺的非阿贝尔规范群的规范理论包含无质量的磁单极子,这些磁单极子被经典地实现为围绕一个或多个有质量的磁单极子的非阿贝尔场云。我们使用模空间的方法来研究这些无质量星云的性质。我们证明了一类具有2 M质量和M(2 M-1)无质量单极子的SU(2 M +2)解的Nahm数据上的自然度规可以由一类更简单的SU(M+1)解的Nahm数据上的自然度规得到。对于M=1的情形,我们证明了Nahm数据度量与BPS解的模度量同构,从而验证了先前的一个结果。对于M=2,我们使用我们的结果和模空间近似,以获得一个有效的拉格朗日轴对称类的解决方案。使用这个拉格朗日量,我们研究了出现的两种类型的云之间的相互作用。我们表明,虽然静态时空场的配置表明,云可能是相当分散的,在散射过程中,他们的行为,如果他们是相对薄的硬壳。

英文摘要:

Some spontaneously broken gauge theories with unbroken non-Abelian gauge groups contain massless magnetic monopoles that are realized classically as clouds of non-Abelian field surrounding one or more massive monopoles. We use moduli space methods to investigate the properties of these massless monopole clouds. We show that the natural metric on the Nahm data for a class of SU(2M+2) solutions with 2M massive and M(2M-1) massless monopoles can be obtained from that for a simpler class of SU(M+1) solutions. For the M=1 case, we show that the Nahm data metric is isomorphic to the metric for the moduli of the BPS solutions, thus verifying a previously conjectured result. For M=2 we use our results and the moduli space approximation to obtain an effective Lagrangian for an axially symmetric class of solutions. Using this Lagrangian, we study the interactions between the two types of clouds that appear. We show that, although the static spacetime field configurations suggest that the clouds might be rather diffuse, in scattering processes they behave as if they were relatively thin hard shells.

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