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arXiv 1004.4550gr-qc
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全纯表象中的自旋泡沫

Spinfoams in the holomorphic representation

Eugenio Bianchi, Elena Magliaro, Claudio Perini

摘要:

研究了自旋泡沫的一个全纯表示。通过Ashtekar-Lewandowski-Marolf-Brachio-Thiemann相干态变换得到了该表示。在全纯表象中,我们导出了欧氏引力和洛伦兹引力的四维自旋泡沫顶点的表达式。这种表示法的优点在于这样一个事实,即所使用的变量在经典的内在和外在空间几何学方面有一个明确的解释。我们展示了如何在外部几何的峰值选择一个单一的指数的Regge行动的半经典大规模渐近的spinfoam顶点。

英文摘要:

We study a holomorphic representation for spinfoams. The representation is obtained via the Ashtekar-Lewandowski-Marolf-Mourão-Thiemann coherent state transform. We derive the expression of the 4d spinfoam vertex for Euclidean and for Lorentzian gravity in the holomorphic representation. The advantage of this representation rests on the fact that the variables used have a clear interpretation in terms of a classical intrinsic and extrinsic geometry of space. We show how the peakedness on the extrinsic geometry selects a single exponential of the Regge action in the semiclassical large-scale asymptotics of the spinfoam vertex.

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