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arXiv 1105.0216gr-qchep-th
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来自spinfoams的Regge重力

Regge gravity from spinfoams

Elena Magliaro, Claudio Perini

摘要:

我们考虑自旋泡沫量子引力在$l_P^2\ll a\ll a/γ$区域的一般三角剖分,即在大面积$a$的经典极限和小Barbero-Immirzi参数$γ$的翻转极限的组合,其中$l_P$是普朗克长度。在几个工作假设下,我们发现翻转极限强制约束,使自旋泡沫理论变成一个有效的以长度为变量的类雷吉量子理论,而经典极限在可能的几何中选择满足爱因斯坦方程的几何。根据$l^2_P/a$和$γl_P^2/a$的幂出现两种量子修正。结果还表明,Barbero-Immirzi参数可能会运行到较小的值下粗粒度的三角剖分。

英文摘要:

We consider spinfoam quantum gravity for general triangulations in the regime $l_P^2\ll a\ll a/γ$, namely in the combined classical limit of large areas $a$ and flipped limit of small Barbero-Immirzi parameter $γ$, where $l_P$ is the Planck length. Under few working hypotheses we find that the flipped limit enforces the constraints that turn the spinfoam theory into an effective Regge-like quantum theory with lengths as variables, while the classical limit selects among the possible geometries the ones satisfying the Einstein equations. Two kinds of quantum corrections appear in terms of powers of $l^2_P/a$ and $γl_P^2/a$. The result also suggests that the Barbero-Immirzi parameter may run to smaller values under coarse-graining of the triangulation.

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