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arXiv 1507.02573gr-qchep-th
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角落里的量子引力

Quantum gravity at the corner

Laurent Freidel, Alejandro Perez

摘要:

本文研究了四维引力系统Cauchy切片边界$2d$表面$S$的量子几何。本文首次详细地研究了在广义相对论的一阶表述中自然产生的边界项--辛流。这个电流与由三重磁场构成的最简单的二次型成正比,并被拉回$S$。我们表明,将是规范的自由度-所产生的$SU(2)$规范变换加上与边界相切的同构,完全由边界$2$维辛形式描述,并产生一个代表性的$SL(2,\mathbb{R}) \times SU(2)$的$S$的每一点。与引力无关,这个系统在量子水平上非常简单和丰富,可能与二维的共形场论有联系。量子理论的一个直接应用是在量子引力中对黑视界的建模。

英文摘要:

We investigate the quantum geometry of $2d$ surface $S$ bounding the Cauchy slices of 4d gravitational system. We investigate in detail and for the first time the symplectic current that naturally arises boundary term in the first order formulation of general relativity in terms of the Ashtekar-Barbero connection. This current is proportional to the simplest quadratic form constructed out of the triad field, pulled back on $S$. We show that the would-be-gauge degrees of freedom---arising from $SU(2)$ gauge transformations plus diffeomorphisms tangent to the boundary, are entirely described by the boundary $2$-dimensional symplectic form and give rise to a representation at each point of $S$ of $SL(2,\mathbb{R}) \times SU(2)$. Independently of the connection with gravity, this system is very simple and rich at the quantum level with possible connections with conformal field theory in 2d. A direct application of the quantum theory is modelling of the black horizons in 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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