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arXiv 1809.10604hep-thcond-mat.str-el
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标记上的西格玛模型

Sigma Models on Flags

Kantaro Ohmori, Nathan Seiberg, Shu-Heng Shao

摘要:

本文研究了以旗流形$U(N)\over U(N_1)\times U(N_2)\cdots U(N_m)$为目标空间的(1+1)维非线性西格玛模型,并重点研究了其特殊情形$U(N)/U(1)^{N}$ .这些推广了众所周知的$\mathbb{CP}^{N-1}$模型。一般的旗帜模型展示了$\mathbb{CP}^{N-1}$模型的特殊情况中不存在的几个新元素。它依赖于更多的参数,它的全局对称性可以更大,它的特胡夫特异常可以更微妙。我们基于对称性和异常性的讨论表明,对于整数$N_I$的某些选择和参数的特定值,该模型在IR中是无间隙的,并且由$SU(N)_1$ WZW模型描述。我们提出的一些技术也可以应用于其他情况。

英文摘要:

We study (1+1)-dimensional non-linear sigma models whose target space is the flag manifold $U(N)\over U(N_1)\times U(N_2)\cdots U(N_m)$, with a specific focus on the special case $U(N)/U(1)^{N}$. These generalize the well-known $\mathbb{CP}^{N-1}$ model. The general flag model exhibits several new elements that are not present in the special case of the $\mathbb{CP}^{N-1}$ model. It depends on more parameters, its global symmetry can be larger, and its 't Hooft anomalies can be more subtle. Our discussion based on symmetry and anomaly suggests that for certain choices of the integers $N_I$ and for specific values of the parameters the model is gapless in the IR and is described by an $SU(N)_1$ WZW model. Some of the techniques we present can also be applied to other cases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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