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arXiv 2103.13284hep-thmath-phmath.MP
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带边界曲面上的相空间辛约化

Phase Space on a Surface with Boundary via Symplectic Reduction

Vyacheslav Lysov

摘要:

本文描述了规范理论中物理相空间的辛约化构造,并将其应用于BF理论。辛约化定理允许我们用规范群作用量将相同的相空间重写为商,这与协变相空间形式主义相匹配。我们将辛约化方法推广到描述带边界切片上初始数据的相空间。我们证明了不变相空间具有广义de Rham上同调的描述,这使得BF理论的拓扑性质得以体现。辛约化可以在多个步骤中使用不同的规范群分解有趣的有限维中间辛空间。

英文摘要:

We describe the symplectic reduction construction for the physical phase space in gauge theory and apply it for the BF theory. Symplectic reduction theorem allows us to rewrite the same phase space as a quotient by the gauge group action, what matches with the covariant phase space formalism. We extend the symplectic reduction method to describe the phase space of the initial data on a slice with boundary. We show that the invariant phase space has description in terms of generalized de Rham cohomology, what makes the topological properties of BF theory manifest. The symplectic reduction can be done in multiple steps using different decompositions of the gauge group with interesting finite-dimensional intermediate symplectic spaces.

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