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
中科院分区:
文献类型:
--
作者:
Seth K. Asante;B. Dittrich;Hal M. Haggard
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.
登录
查看更多内容
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
影响因子:
5
作者:
Bahr B;Steinhaus S.
通讯作者:
Steinhaus S.
影响因子:
3.5
作者:
通讯作者:
--
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
影响因子:
3.5
作者:
Bahr B;Dittrich B;Geiller M.
通讯作者:
Geiller M.