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arXiv 0904.2234hep-thgr-qcmath-phmath.MPmath.QA
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Beta-Gamma系统与BRST算子的变形

Beta-gamma systems and the deformations of the BRST operator

Anton M. Zeitlin

摘要:

我们描述了与闭弦和开弦相关的简单对数CFTs之间的关系,以及它们的“无限度量”极限,对应于β-γ系统。这种关系的BRST复杂的水平上进行了研究:我们表明,考虑度量作为一个扰动导致一定的变形的代数运算的连-Zuckerman型顶点代数,与β-γ系统。在准经典近似下,对应于这种变形结构的Maurer-Cartan方程导致非线性场方程。作为一个明确的例子,我们证明,使用这种结构,杨米尔斯方程可以推导出来。这引起了一个非平凡的关系之间的柯朗-多尔夫曼代数体和同伦代数出现的规范理论。我们还讨论了可能的代数方法的研究β-函数的sigma模型。

英文摘要:

We describe the relation between simple logarithmic CFTs associated with closed and open strings, and their "infinite metric" limits, corresponding to the beta-gamma systems. This relation is studied on the level of the BRST complex: we show that the consideration of metric as a perturbation leads to a certain deformation of the algebraic operations of the Lian-Zuckerman type on the vertex algebra, associated with the beta-gamma systems. The Maurer-Cartan equations corresponding to this deformed structure in the quasiclassical approximation lead to the nonlinear field equations. As an explicit example, we demonstrate, that using this construction, Yang-Mills equations can be derived. This gives rise to a nontrivial relation between the Courant-Dorfman algebroid and homotopy algebras emerging from the gauge theory. We also discuss possible algebraic approach to the study of beta-functions in sigma-models.

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