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arXiv 0706.0469gr-qc
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圈量子引力中体积算符的性质I:结果

Properties of the Volume Operator in Loop Quantum Gravity I: Results

Johannes Brunnemann, David Rideout

摘要:

分析了三维黎曼空间中经典体积表达式的量子模拟--圈量子引力中Ashtekar和Lewandowski体积算符的谱性质.我们的分析认为,第一次通用图顶点的效价大于4。在这里,我们发现,底层顶点的几何特征的体积算子的频谱特性,特别是存在的“体积间隙”(频谱中的最小非零特征值)被发现依赖于顶点嵌入。我们计算了5- 7价顶点的所有非空间同胚非共面顶点嵌入的集合,并论证了这些集合可以用来标记空间同胚不变态。我们观察规范不变性如何以自然的方式连接顶点几何和底层规范群的表示属性。分析结果的光谱上的4价顶点,其中存在的体积间隙被证明。本文介绍了我们的主要结果;详细信息由配套文件arXiv:0706.0382v1提供。

英文摘要:

We analyze the spectral properties of the volume operator of Ashtekar and Lewandowski in Loop Quantum Gravity, which is the quantum analogue of the classical volume expression for regions in three dimensional Riemannian space. Our analysis considers for the first time generic graph vertices of valence greater than four. Here we find that the geometry of the underlying vertex characterizes the spectral properties of the volume operator, in particular the presence of a `volume gap' (a smallest non-zero eigenvalue in the spectrum) is found to depend on the vertex embedding. We compute the set of all non-spatially diffeomorphic non-coplanar vertex embeddings for vertices of valence 5--7, and argue that these sets can be used to label spatial diffeomorphism invariant states. We observe how gauge invariance connects vertex geometry and representation properties of the underlying gauge group in a natural way. Analytical results on the spectrum on 4-valent vertices are included, for which the presence of a volume gap is proved. This paper presents our main results; details are provided by a companion paper arXiv:0706.0382v1.

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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