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arXiv 1809.09248hep-thgr-qcmath-phmath.MP
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有边界条件下拓扑理论的Hamilton分析

Hamiltonian analysis of a topological theory in the presence of boundaries

Alejandro Corichi, Tatjana Vukašinac

摘要:

我们对拓扑规范理论进行正则哈密顿分析,它既可以看作是一个定义在有边界的四维时空区域上的理论--体理论--,也可以看作是一个定义在区域边界上的理论--边界理论--。在我们的例子中,体理论由四维$U(1)$ Pontryagin作用量给出,边界理论由$U(1)$ Chern-Simons作用量定义。我们分析的条件,需要施加在散装理论,使总的哈密顿量,涂抹的约束和发电机的规范变换被很好地定义(可微)的一般边界条件。我们特别注意的约束和边界条件之间的相互作用,在散装理论的一面,在边界理论的约束,在另一边。我们说明这两种理论是等价的,尽管不同的规范变量和约束结构,明确表明,他们都有相同的对称性,自由度和可观的。

英文摘要:

We perform the canonical Hamiltonian analysis of a topological gauge theory, that can be seen both as a theory defined on a four dimensional spacetime region with boundaries --the bulk theory--, or as a theory defined on the boundary of the region --the boundary theory--. In our case the bulk theory is given by the 4-dimensional $U(1)$ Pontryagin action and the boundary one is defined by the $U(1)$ Chern-Simons action. We analyse the conditions that need to be imposed on the bulk theory so that the total Hamiltonian, smeared constraints and generators of gauge transformations be well defined (differentiable) for generic boundary conditions. We pay special attention to the interplay between the constraints and boundary conditions in the bulk theory on the one side, and the constraints in the boundary theory, on the other side. We illustrate how both theories are equivalent, despite the different canonical variables and constraint structure, by explicitly showing that they both have the same symmetries, degrees of freedom and observables.

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