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arXiv 1407.8079math-phhep-thmath.MP
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弯曲时空中规范场理论的BRST形式体系中的经典相空间和Hadamard态

Classical phase space and Hadamard states in the BRST formalism for gauge field theories on curved spacetime

Michał Wrochna, Jochen Zahn

摘要:

我们研究了整体双曲时空的线性化规范理论。提出了经典相空间及其柯西曲面类似物的一致定义。我们证明,它是同构的相空间的辅助条件方法的哈克和申克尔的情况下,麦克斯韦,杨米尔斯,和Rarita-Schwinger字段。在BRST形式主义中以标准的方式定义Hadamard态,它们在Maxwell和Yang-Mills情况下的存在性是从辅助条件(或Gupta-Bleeland)形式主义中的已知结果得出的。在我们的框架内,我们还制定了BRST上同调的相空间的非退化的标准,并讨论了特殊情况。其中包括杨-米尔斯案例中的一个例子,其中退化与柯西曲面的非平凡拓扑无关。

英文摘要:

We investigate linearized gauge theories on globally hyperbolic spacetimes in the BRST formalism. A consistent definition of the classical phase space and of its Cauchy surface analogue is proposed. We prove that it is isomorphic to the phase space in the subsidiary condition approach of Hack and Schenkel in the case of Maxwell, Yang-Mills, and Rarita-Schwinger fields. Defining Hadamard states in the BRST formalism in a standard way, their existence in the Maxwell and Yang-Mills case is concluded from known results in the subsidiary condition (or Gupta-Bleuler) formalism. Within our framework, we also formulate criteria for non-degeneracy of the phase space in terms of BRST cohomology and discuss special cases. These include an example in the Yang-Mills case, where degeneracy is not related to a non-trivial topology of the Cauchy surface.

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