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arXiv 1012.3832gr-qc
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简化圈量子引力模型的U(N)不变动力学

U(N) invariant dynamics for a simplified Loop Quantum Gravity model

Enrique F. Borja, Jacobo Díaz-Polo, Iñaki Garay, Etera R. Livine

摘要:

圈量子引力(LQG)中动力学的实现仍然是一个悬而未决的问题。在这里,我们讨论了LQG中最简单的一类图的尝试性动力学:两个顶点与任意数量的边相连。我们使用最近引入的U(N)框架,以构建SU(2)不变算子,并定义一个全局U(N)对称性,将选择均匀/各向同性的状态。最后,我们提出了一个哈密顿算子不变的边界面的面积保持变形下,我们确定这个模型与圈量子宇宙学的可能连接。

英文摘要:

The implementation of the dynamics in Loop Quantum Gravity (LQG) is still an open problem. Here, we discuss a tentative dynamics for the simplest class of graphs in LQG: Two vertices linked with an arbitrary number of edges. We use the recently introduced U(N) framework in order to construct SU(2) invariant operators and define a global U(N) symmetry that will select the homogeneous/isotropic states. Finally, we propose a Hamiltonian operator invariant under area-preserving deformations of the boundary surface and we identify possible connections of this model with Loop Quantum Cosmology.

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