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arXiv 1006.0903hep-thgr-qcmath-phmath.MP
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2- BF理论的Lie交叉模和规范不变作用量

Lie crossed modules and gauge-invariant actions for 2-BF theories

Joao Faria Martins, Aleksandar Mikovic

摘要:

我们将BF理论的作用推广到一般Lie交叉模$(H \to G)$的情形,其中$G$和$H$是非交换李群.我们的建设需要存在的$G$不变的非退化双线性形式的李代数$G$和$H$,我们表明,有许多这样的李交叉模块的例子,通过使用交叉模块的建设提供的短链复合向量空间。我们还推广这种建设的任意链复杂的向量空间,有限型。我们构造了两个规范不变作用量的2-平坦和假平坦2-连接与辅助场。第一个作用与Girelli,Pfeiffer和Popescu为一类特殊的Lie交叉模引入的BFCG作用是同一类型的,其中$H$是交换的.第二个动作是一个扩展的BFCG动作,它包含一个附加的辅助字段。然而,这两个动作通过字段重定义而关联。我们还构建了一个三参数变形的扩展的BFCG行动,我们相信这是相关的非平凡的不变量的打结嵌入在四个球体的表面的建设。

英文摘要:

We generalize the BF theory action to the case of a general Lie crossed module $(H \to G)$, where $G$ and $H$ are non-abelian Lie groups. Our construction requires the existence of $G$-invariant non-degenerate bilinear forms on the Lie algebras of $G$ and $H$ and we show that there are many examples of such Lie crossed modules by using the construction of crossed modules provided by short chain complexes of vector spaces. We also generalize this construction to an arbitrary chain complex of vector spaces, of finite type. We construct two gauge-invariant actions for 2-flat and fake-flat 2-connections with auxiliary fields. The first action is of the same type as the BFCG action introduced by Girelli, Pfeiffer and Popescu for a special class of Lie crossed modules, where $H$ is abelian. The second action is an extended BFCG action which contains an additional auxiliary field. However, these two actions are related by a field redefinition. We also construct a three-parameter deformation of the extended BFCG action, which we believe to be relevant for the construction of non-trivial invariants of knotted surfaces embedded in the four-sphere.

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