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arXiv 1012.0053gr-qc
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圈量子引力的对称约化

Symmetry Reduction of Loop Quantum Gravity

Johannes Brunnemann, Tim A. Koslowski

摘要:

标准圈量子宇宙学与全圈量子引力之间的关系在第一个非平凡步骤就已经失败了:由于拓扑障碍,圈量子宇宙学的位形空间不能嵌入到全圈量子引力的位形空间中。我们详细研究这种障碍,因为许多拓扑障碍物的物理效果的来源。为此,我们导出了圈量子引力位形空间的一大类子空间的拓扑。这使我们能够找到标准圈量子宇宙学配置空间的扩展,该配置空间允许与Fleischhack:2010一致的嵌入。然后,我们构造了平坦FRW圈量子宇宙学的嵌入,并发现它与标准LQC渐近一致。

英文摘要:

The relation between standard Loop Quantum Cosmology and full Loop Quantum Gravity fails already at the first nontrivial step: The configuration space of Loop Quantum Cosmology can not be embedded into the configuration space of full Loop Quantum Gravity due to a topological obstruction. We investigate this obstruction in detail, because many topological obstructions are the source of physical effects. For this we derive the topology of a large class of subspaces of the Loop Quantum Gravity configuration space. This allows us to find the extension of the standard Loop Quantum Cosmology configuration space that admits an embedding in agreement with Fleischhack:2010. We then construct the embedding for flat FRW Loop Quantum Cosmology and find that it coincides asymptotically with standard LQC.

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