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arXiv 0709.4636gr-qc
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圈量子引力规范不变相干态II:非阿贝尔规范群

Gauge-invariant coherent states for Loop Quantum Gravity II: Non-abelian gauge groups

Benjamin Bahr, Thomas Thiemann

摘要:

这是第二篇关于圈量子引力规范不变相干态的论文。在这里,我们处理规范群SU(2),这是一个显着的复杂性相比,在前面的文章中遇到的阿贝尔U(1)的情况。本文用解析和数值方法研究了某些特殊图上的规范不变相干态。我们发现,它们的重叠是高斯峰值规范不变量,只要状态不被标记的退化规范轨道,即点的规范不变的配置空间具有奇点。在这些情况下,重叠仍然集中在这些点周围,但峰形显示出平台结构。这表明了态的半经典性质如何受到规范不变相空间几何形状的影响。

英文摘要:

This is the second paper concerning gauge-invariant coherent states for Loop Quantum Gravity. Here, we deal with the gauge group SU(2), this being a significant complication compared to the abelian U(1) case encountered in the previous article. We study gauge-invariant coherent states on certain special graphs by analytical and numerical methods. We find that their overlap is Gauss-peaked in gauge-invariant quantities, as long as states are not labeled by degenerate gauge orbits, i.e. points where the gauge-invariant configuration space has singularities. In these cases the overlaps are still concentrated around these points, but the peak profile exhibits a plateau structure. This shows how the semiclassical properties of the states are influenced by the geometry of the gauge-invariant phase space.

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