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arXiv 1209.4858gr-qchep-th
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共形球面上的2+1引力

2+1 gravity on the conformal sphere

Sean Gryb, Flavio Mercati

摘要:

证明了具有非零宇宙学常数的2+1引力有两个等价的一阶描述。一个是众所周知的时空描述,另一个是在进化的共形几何。连接这些图像的关键工具是Cartan几何,它是黎曼几何的推广,允许在任意齐次空间中局部建模几何。这两种不同的解释表明了两种不同的相空间缩减。时空图像导致2+1公式的广义相对论由于阿诺维特,Deser和Misner,而共形图像导致形状动力学。因此,嘉当几何为解释广义相对论和形状动力学的等价性提供了对称性交易的替代方案。

英文摘要:

We show that there are 2 equivalent first order descriptions of 2+1 gravity with non-zero cosmological constant. One is the well-known spacetime description and the other is in terms of evolving conformal geometry. The key tool that links these pictures is Cartan geometry, a generalization of Riemannian geometry that allows for geometries locally modelled off arbitrary homogeneous spaces. The two different interpretations suggest two distinct phase space reductions. The spacetime picture leads to the 2+1 formulation of General Relativity due to Arnowitt, Deser, and Misner while the conformal picture leads to Shape Dynamics. Cartan geometry thus provides an alternative to symmetry trading for explaining the equivalence of General Relativity and Shape Dynamics.

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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