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arXiv 0707.4513gr-qchep-lat
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4-单纯形Regge action的线性化动力学

Linearized dynamics from the 4-simplex Regge action

Bianca Dittrich, Laurent Freidel, Simone Speziale

摘要:

研究了4-单形上黎曼雷鬼作用量的海森矩阵与线性化量子引力的关系。我们给出了一个明确的公式作为几何的函数的海森,并表明它有一个单一的零模式。然后,我们使用一个三维格点模型,以显示(i)零模是一个残余的连续谱同态不变性,和(ii)我们恢复完整的自由引力子传播子在连续极限。这些结果有助于澄清最近在圈量子引力中计算引力子传播子所需的边界态结构,特别是它在固定规范中的作用。

英文摘要:

We study the relation between the hessian matrix of the riemannian Reggae action on a 4-simplex and linearized quantum gravity. We give an explicit formula for the hessian as a function of the geometry, and show that it has a single zero mode. We then use a 3d lattice model to show that (i) the zero mode is a remnant of the continuum diffeomorphism invariance, and (ii) we recover the complete free graviton propagator in the continuum limit. The results help clarify the structure of the boundary state needed in the recent calculations of the graviton propagator in loop quantum gravity, and in particular its role in fixing the gauge.

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