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arXiv 0904.1035hep-th
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N = 2超对称QCD中的非阿贝尔对偶与禁闭

Non-Abelian Duality and Confinement in N=2 Supersymmetric QCD

M. Shifman, A. Yung

摘要:

在N = 2的U(N)规范群超对称QCD中,当N_f> N时,我们研究了从大λ时的弱耦合到小λ时的强耦合的交叉跃迁,其中λ是Fayet-Iliopoulos参数。我们发现,在强耦合的对偶非阿贝尔弱耦合N = 2的理论存在,它描述了低能物理在小π。对偶规范群为U(N_f-N),对偶理论具有N_f轻双子的味道,与原U(N)理论中的N_f夸克相比较。尽管SU(N)和SU(N_f-N)因子的物理意义在大、小尺度下是不同的,但原始理论和对偶理论都是希格斯的,并且具有相同的整体对称性SU(N)× SU(N_f-N)× U(1)。这两种制度都支持非阿贝尔半局部弦。在这两个区域中,处于其中一个因子群的伴随表示中的粒子存在于两种类型中:基本场和由弦束缚的复合态。这些品种在从一种制度过渡到另一种制度时互换。我们推测复合弦态可能与Seiberg的M场有关。我们观察到的体对偶性转化为非阿贝尔弦的世界片上的二维对偶性。在大范围内,半局域非阿贝尔弦的内部动力学可以用N个取向模和(N_f-N)个尺寸模的西格玛模型来描述,而在小范围内,取向模和尺寸模的作用互换.两个双西格玛模型(描述体理论中的受限单极子/双子子)的BPS谱重合。在我们发现的非阿贝尔对偶性和弦论构造之间寻找相似之处,会很有趣。

英文摘要:

In N=2 supersymmetric QCD with the U(N) gauge group and N_f>N we study the crossover transition from the weak coupling regime at large ξto strong coupling at small ξwhere ξis the Fayet--Iliopoulos parameter. We find that at strong coupling a dual non-Abelian weakly coupled N=2 theory exists which describes low-energy physics at small ξ. The dual gauge group is U(N_f-N) and the dual theory has N_f flavors of light dyons, to be compared with N_f quarks in the original U(N) theory. Both, the original and dual theories are Higgsed and share the same global symmetry SU(N) x SU(N_f-N) x U(1), albeit the physical meaning of the SU(N) and SU(N_f-N) factors is different in the large- and small-ξregimes. Both regimes support non-Abelian semilocal strings. In each of these two regimes particles that are in the adjoint representations with respect to one of the factor groups exist in two varieties: elementary fields and composite states bound by strings. These varieties interchange upon transition from one regime to the other. We conjecture that the composite stringy states can be related to Seiberg's M fields. The bulk duality that we observed translates into a two-dimensional duality on the world sheet of the non-Abelian strings. At large ξthe internal dynamics of the semilocal non-Abelian strings is described by the sigma model of N orientational and (N_f-N) size moduli, while at small ξthe roles of orientational and size moduli interchange. The BPS spectra of two dual sigma models (describing confined monopoles/dyons of the bulk theory) coincide. It would be interesting to trace parallels between the non-Abelian duality we found and string theory constructions.

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