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arXiv 0903.5022hep-th
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AdS(5)× S(5)中无质量顶点算子的对称性

Symmetries of massless vertex operators in AdS(5) x S(5)

Andrei Mikhailov

摘要:

AdS(5)x S(5)中超弦的世界表σ模型有一个单参数的平坦连接族,由谱参数化。相应的威尔逊线不是BRST不变的开放轮廓,因为BRST变换导致边界项。这些边界项定义了与轮廓端点相关的上同调复形。我们研究了威尔逊线在某些无限维表示中的复形的上同调。我们发现,这些表示的上同调是非平凡的鬼数2。这意味着有可能定义一条BRST不变的开威尔逊线。构造的中心点是在整体对称群的作用下存在精确协变变换的无质量顶点算子。在平坦空间中,无质量顶点的变换协变仅限于增加BRST精确项。但是在AdS中,我们证明了定义顶点使它们完全协变变换是可能的。

英文摘要:

The worldsheet sigma-model of the superstring in AdS(5) x S(5) has a one-parameter family of flat connections parametrized by the spectral parameter. The corresponding Wilson line is not BRST invariant for an open contour, because the BRST transformation leads to boundary terms. These boundary terms define a cohomological complex associated to the endpoint of the contour. We study the cohomology of this complex for Wilson lines in some infinite-dimensional representations. We find that for these representations the cohomology is nontrivial at the ghost number 2. This implies that it is possible to define a BRST invariant open Wilson line. The central point in the construction is the existence of massless vertex operators transforming exactly covariantly under the action of the global symmetry group. In flat space massless vertices transform covariantly only up to adding BRST exact terms. But in AdS we show that it is possible to define vertices so that they transform exactly covariantly.

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