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arXiv 1607.00342hep-th
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超越标准规范:狄拉克西格玛模型的规范对称性

Beyond the standard gauging: gauge symmetries of Dirac Sigma Models

Athanasios Chatzistavrakidis, Andreas Deser, Larisa Jonke, Thomas Strobl

摘要:

在本文中,我们研究的一般条件,必须满足规范扩展的二维玻色子σ模型存在。在确定一个整体的对称性,然后将其提升到一个本地的通常方法的反转,我们直接专注于理论的规范对称性。这允许的作用泛函是规范不变的,而一般的背景领域的意义上说,他们的不变性条件是温和的比通常的情况下。特别地,控制测量的矢量场不需要是Killing。背景场的等距松弛由规范场取值的李代数体L上的两个连接控制,这是普通李代数图像的推广。在这里,我们表明,这些连接总是可以确定时,L是一个狄拉克结构的H-扭曲的柯朗代数体。这也导致我们推导出一个广泛的一类二维拓扑场论的规范对称性的一般形式,称为狄拉克σ模型,它介于G/G Wess-Zumino-Witten模型和(Wess-Zumino项扭曲的)泊松西格玛模型之间。

英文摘要:

In this paper we study the general conditions that have to be met for a gauged extension of a two-dimensional bosonic sigma-model to exist. In an inversion of the usual approach of identifying a global symmetry and then promoting it to a local one, we focus directly on the gauge symmetries of the theory. This allows for action functionals which are gauge invariant for rather general background fields in the sense that their invariance conditions are milder than the usual case. In particular, the vector fields that control the gauging need not be Killing. The relaxation of isometry for the background fields is controlled by two connections on a Lie algebroid L in which the gauge fields take values, in a generalization of the common Lie-algebraic picture. Here we show that these connections can always be determined when L is a Dirac structure in the H-twisted Courant algebroid. This also leads us to a derivation of the general form for the gauge symmetries of a wide class of two-dimensional topological field theories called Dirac sigma-models, which interpolate between the G/G Wess-Zumino-Witten model and the (Wess-Zumino-term twisted) Poisson sigma model.

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