Discrete gravity dynamics from effective spin foams

Discrete gravity dynamics from effective spin foams
复制标题

有效纺丝泡沫的离散重力动力学

DOI:
--
复制
发表时间:
2020
影响因子:
3.5
通讯作者:
Hal M. Haggard
Hal M. Haggard
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Seth K. Asante;B. Dittrich;Hal M. Haggard

文献摘要

参考文献

被引文献

相似文献

首次对自旋泡沫动力学进行了计算,对重力运动的量子方程进行了检验。具体地说,处理的是包含内边的三角剖分。该计算利用了最近引入的有效自旋泡沫模型,该模型在数值上特别有效。以前的工作已经引起了对自旋泡沫动力学中平坦度问题的关注,确定了动力学在小ℏ半经典极限下导致平坦几何的可能性。这里给出的数值结果揭示了一个丰富的半经典区域,但必须理解为自旋泡沫模型的各种参数之间的相互作用。特别是,三角剖分的规模,由其边界三角形的面积固定,面积谱的离散性,来自循环量子重力的输入,以及主体三角形周围的曲率尺度,都进入了这里所确定的半经典制度的特征。除了这些关于动力学的结果外,我们还证明了半经典机制的微妙性质是具有第二类约束系统的路径积分量子化的一般特征。
The first computation of a spin foam dynamics that provides a test of the quantum equations of motions of gravity is presented. Specifically, a triangulation that includes an inner edge is treated. The computation leverages the recently introduced effective spin foam models, which are particularly numerically efficient. Previous work has raised the concern of a flatness problem in spin foam dynamics, identifying the potential for the dynamics to lead to flat geometries in the small ℏ semiclassical limit. The numerical results presented here expose a rich semiclassical regime, but one that must be understood as an interplay between the various parameters of the spin foam model. In particular, the scale of the triangulation, fixed by the areas of its boundary triangles, the discreteness of the area spectrum, input from loop quantum gravity, and the curvature scales around the bulk triangles, all enter the characterization of the semiclassical regime identified here. In addition to these results on the dynamics, we show that the subtle nature of the semiclassical regime is a generic feature of the path integral quantization of systems with second class constraints.
DOI: 10.1088/0264-9381/27/16/165009
发表时间: 2009-07
影响因子: 3.5
作者:
J. Barrett;R. J. Dowdall;W. Fairbairn;F. Hellmann;R. Pereira
通讯作者: J. Barrett;R. J. Dowdall;W. Fairbairn;F. Hellmann;R. Pereira
用量子长方体缠绕器研究自旋泡沫路径积分
DOI: 10.1103/physrevd.93.104029
发表时间: --
期刊: Physical Review D
影响因子: 5
作者:
Bahr B;Steinhaus S.
通讯作者: Steinhaus S.
旋转泡沫模型的背景无关重整化
DOI: 10.1088/1361-6382/aa5e13
发表时间: --
影响因子: 3.5
作者:
通讯作者: --
DOI: 10.1103/physrevd.100.106003
发表时间: 2019-03
期刊: Physical Review D
影响因子: 5
作者:
P. Donà;Marco Fanizza;Giorgio Sarno;Simone Speziale
通讯作者: P. Donà;Marco Fanizza;Giorgio Sarno;Simone Speziale
DOI: 10.1088/1361-6382/abfed1
发表时间: --
影响因子: 3.5
作者:
Bahr B;Dittrich B;Geiller M.
通讯作者: Geiller M.