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arXiv 2108.02202hep-th
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二维QCD的红外位相

Infrared phases of 2d QCD

Diego Delmastro, Jaume Gomis, Matthew Yu

摘要:

本文给出了在规范群G的任意表示中,无质量胶子和左右手征夸克的二维QCD理论产生质量隙的充分必要条件。这些结果是从光锥和时间QCD哈密顿量的光谱性质得到的。这些条件可以显式求解,我们提供了所有在光谱中具有量子力学能隙的2d QCD理论的完整列表,而列表中没有的任何其他理论都是无能隙的。缺隙理论的列表包括夸克在矢量和手征表象中的QCD模型。有隙理论由几个无限族的经典规范群组成,夸克在秩1和2表示中,加上有限数量的孤立情况。我们还提出并分析了QCD-TQFTs对带隙理论和CFTs对无隙理论的有效红外描述,并展示了红外中几个有趣的特征,如非平凡的全局t Hooft异常和突现超对称的存在。我们确定二维QCD理论,在红外线流到著名的CFTs,如极小模型,玻色子和超对称,Wess-Zumino-Witten和Kazama-Suzuki模型。

英文摘要:

We derive the necessary and sufficient conditions for a 2d QCD theory of massless gluons and left and right chiral quarks in arbitrary representations of a gauge group G to develop a mass gap. These results are obtained from spectral properties of the lightcone and temporal QCD Hamiltonians. The conditions can be explicitly solved, and we provide the complete list of all 2d QCD theories that have a quantum mechanical gap in the spectrum, while any other theory not in the list is gapless. The list of gapped theories includes QCD models with quarks in vector-like as well as chiral representations. The gapped theories consist of several infinite families of classical gauge groups with quarks in rank 1 and 2 representations, plus a finite number of isolated cases. We also put forward and analyze the effective infrared description of QCD - TQFTs for gapped theories and CFTs for gapless theories - and exhibit several interesting features in the infrared, such as the existence of non-trivial global 't Hooft anomalies and emergent supersymmetry. We identify 2d QCD theories that flow in the infrared to celebrated CFTs such as minimal models, bosonic and supersymmetric, and Wess-Zumino-Witten and Kazama-Suzuki models.

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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