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arXiv 0906.4524gr-qc
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一个允许SU(2)联络形式的引力拓扑极限

A topological limit of gravity admitting an SU(2) connection formulation

Lihui Liu, Merced Montesinos, Alejandro Perez

摘要:

本文研究了由拉格朗日4-形式L=e_I e_J F^{IJ}(ω)定义的广义协变理论的哈密顿公式,其中e^I是四元组场,F^{IJ}是洛伦兹联络ω^{IJ}的曲率。这个理论可以被认为是霍尔斯特引力作用量的极限,因为牛顿常数G趋于无穷大,而伊米兹参数趋于零,同时保持它们的乘积固定。这个理论很长一段时间以来一直被证明是拓扑的。我们证明了这一点,无论是在协变相空间制定以及在标准狄拉克制定。在时间规范中,理论的无约束相空间有一个SU(2)联络公式,使它与引力的无约束相空间在Ashtekar-Barbero变量下同构。在可能的物理应用中,我们认为,这种拓扑理论的量子化可能会揭示新的自由度的性质,负责在圈量子引力的黑熵。

英文摘要:

We study the Hamiltonian formulation of the generally covariant theory defined by the Lagrangian 4-form L=e_I e_J F^{IJ}(ω) where e^I is a tetrad field and F^{IJ} is the curvature of a Lorentz connection ω^{IJ}. This theory can be thought of as the limit of the Holst action for gravity for the Newton constant G goes to infinity and Immirzi parameter goes to zero, while keeping their product fixed. This theory has for a long time been conjectured to be topological. We prove this statement both in the covariant phase space formulation as well as in the standard Dirac formulation. In the time gauge, the unconstrained phase space of theory admits an SU(2) connection formulation which makes it isomorphic to the unconstrained phase space of gravity in terms of Ashtekar-Barbero variables. Among possible physical applications, we argue that the quantization of this topological theory might shed new light on the nature of the degrees of freedom that are responsible for black entropy in loop quantum gravity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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