Causal Dynamical Triangulations without preferred foliation

Causal Dynamical Triangulations without preferred foliation
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DOI:
10.1016/j.physletb.2013.06.007
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发表时间:
2013-05
期刊:
影响因子:
4.4
通讯作者:
S. Jordan;R. Loll;R. Loll
S. Jordan;R. Loll;R. Loll
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
S. Jordan;R. Loll;R. Loll

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我们介绍了一个广义版本的因果动态三角(CDT)制定的量子引力,其中正则化,三角路径积分的历史保持其因果性质,但没有一个首选的适当的时间叶。对2+1维非微扰路径积分的广泛数值研究表明,它仍然可以在大尺度上再现扩展的德西特宇宙的出现,这是CDT量子引力的一个关键特征。这表明CDT中通常使用的首选叶理并不是其背景结构的关键(尽管方便)部分。
We introduce a generalized version of the Causal Dynamical Triangulations (CDT) formulation of quantum gravity, in which the regularized, triangulated path integral histories maintain their causal properties, but do not have a preferred proper-time foliation. An extensive numerical study of the associated nonperturbative path integral in 2+1 dimensions shows that it can nevertheless reproduce the emergence of an extended de Sitter universe on large scales, a key feature of CDT quantum gravity. This suggests that the preferred foliation normally used in CDT is not a crucial (albeit convenient) part of its background structure.