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arXiv 0706.0446hep-th
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杨-米尔斯-希格斯理论中与引力耦合的弦

Strings in Yang-Mills-Higgs theory coupled to gravity

L. G. Aldrovandi

摘要:

本文构造了Einstein-Yang-Mills-Higgs理论的非阿贝尔弦。我们考虑了在U(1)xSU(N_c)规范群的基本表象中的N_f Higgs场,以保持色味SU(N_c)群的完整性。通过选取合适的度量矩阵,得到了Bogomol'nyi型一阶方程的旋转对称解。在N_f = N_c的情况下,解是局部弦,并通过用定向集体坐标参数化它们来证明它们是真正非阿贝尔的。当N_f > N_c时,解对应于半局域弦,除了定向自由度外,还获得了附加的集体坐标,参数化了它们的横向尺寸。相应的模量的低能有效理论被发现,表明所有的零模式是正规化的引力存在下,即使在半局域的情况下。

英文摘要:

Non-Abelian strings for an Einstein-Yang-Mills-Higgs theory are explicitly constructed. We consider N_f Higgs fields in the fundamental representation of the U(1)xSU(N_c) gauge group in order to have a color-flavor SU(N_c) group remaining unbroken. Choosing a suitable ansatz for the metric, Bogomol'nyi-like first order equations are found and rotationally symmetric solutions are proposed. In the N_f = N_c case, solutions are local strings and are shown to be truly non-Abelian by parameterizing them in terms of orientational collective coordinates. When N_f > N_c, the solutions correspond to semilocal strings which, beside the orientational degrees of freedom, acquire additional collective coordinates parameterizing their transverse size. The low-energy effective theories for the correspondent moduli are found, showing that all zero modes are normalizable in presence of gravity, even in the semilocal case.

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