Indications of Causal Set Cosmology
Indications of Causal Set Cosmology
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因果集宇宙学的迹象
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
R. Sorkin
中科院分区：
文献类型：
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作者：
R. Sorkin
在最近提出的一系列因果集随机动力学定律的背景下，人们可以问宇宙是否可能在量子引力时代出现时具有足够大的尺寸和足够的同质性来解释其当今的大尺度结构。一般来说，这种情况预计需要在理论中引入非常大或非常小的基本参数。然而，有迹象表明，这种“微调”是不必要的，由于一种与宇宙膨胀和塌缩循环相关的重整化群的作用，一个大的均匀和各向同性的宇宙可以自然地出现。
Within the context of a recently proposed family of stochastic dynamical lawsfor causal sets, one can ask whether the universe might have emerged from thequantum-gravity era with a large enough size and with sufficient homogeneityto explain its present-day large-scale structure. In general, such a scenario wouldbe expected to require the introduction of very large or very small fundamentalparameters into the theory. However, there are indications that such “fine tuning”is not necessary, and a large homogeneous and isotropic cosmos can emergenaturally thanks to the action of a kind of renormalization group associated withcosmic cycles of expansion and recollapse.