Suture
发表于 2025-3-21 16:08:17
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使虚弱
发表于 2025-3-21 22:35:46
General Relativity, This chapter provides a short review of important concepts and some technicalities of the gravitational theory. It can serve as a very brief introduction to the Einstein theory of gravity. It contains all the necessary material to understand the next chapters of this book. With this spirit, we foll
反叛者
发表于 2025-3-22 04:11:19
The Standard Model of Particle Physics,al forces of Nature except gravity. It is the second fundamental ingredient of the Standard Model of cosmology. Here matter is described by fermions, spin-1/2 particles. Fermions are grouped into two classes, namely leptons and quarks, on the basis of their interaction properties. Leptons participat
Jocose
发表于 2025-3-22 04:42:31
Cosmological Models, hypothesis, we can derive a number of cosmological models that differ by their matter content. In all the physically interesting cases, the Universe starts from an extremely dense and hot state. The onset of this hot initial state is called big bang. The rate of the expansion and the fate of the Un
盲信者
发表于 2025-3-22 12:47:20
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Awning
发表于 2025-3-22 15:49:29
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Albinism
发表于 2025-3-22 19:38:08
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不法行为
发表于 2025-3-22 23:40:24
Big Bang Nuclesynthesis,ical predictions of the abundances of deuterium, helium-3, helium-4, and lithium-7 are determined by the Friedmann equations, the matter content of the Standard Model of particle physics, and a large number of particle properties and nuclear reaction rates that can be measured in laboratory. With al
大方一点
发表于 2025-3-23 04:34:29
Dark Matter,ctuations of the CMB, suggests that most of the matter in the Universe does not emit electromagnetic radiation. This stuff is usually called dark matter and its nature is currently unknown. From the BBN, we can indeed infer that dark matter is unlikely made of ordinary particles (protons, neutrons,
anthropologist
发表于 2025-3-23 09:29:22
Cosmic Microwave Background,light elements. As the Universe expanded, at a certain point photons in the primordial plasma decoupled from protons and electrons and started freely propagating through the Universe. These are the photons we observe today in the CMB. The spectrum is extremely close to that of a black body with a te