宇宙学

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Weyl假设和宇宙时间

Weyl's principle, cosmic time and quantum
fundamentalism

宇宙的视界

学习宇宙学的过程中都会遇到两个概念:粒子视界(particle horizon)和事件视界(event horizon),都用来描述宇宙的边界。从表达式上这两种视界很容易区分,一个是将径向距离向过去积分直到宇宙的起点;另一个是将径向距离向未来积分直到无穷久的未来。但为何一个叫粒子视界,另一个叫事件视界,这其中有何蕴意?

尝试理解如下:

央视《宇宙大爆炸》科普片

由国家天文台陈学雷研究员等撰稿并参与制作的《宇宙大爆炸》4集科普片,经陈学雷研究员授权现放在了下面网址:

A discriminating probe of gravity at cosmological scales

Cosmological model selection

Abstract: Model selection aims to determine which theoretical models are most plausible

Evolution of the 21 cm signal throughout cosmic history

Authors: Jonathan R. Pritchard (CfA), Abraham Loeb (CfA)

A New Estimate of the Hubble Time with Improved Modeling of Gravitational Lenses

 A New Estimate of the Hubble Time with Improved Modeling of Gravitational Lenses

Authors: Jonathan Coles

Quantum bounce and cosmic recall

Abstract: Loop quantum cosmology predicts that, in simple models, the big bang
singularity of classical general relativity is replaced by a quantum bounce.