Big Bang nucleosynthesis and the baryonic content of the universeT X ThuanY Izotov
Steigman, Gary, Primordial Nucleosynthesis: Successes And ChallengesarXiv:astro-ph/0511534; Forensic Cosmology: Probing Baryons and Neutrinos With BBN and the CBRarXiv:hep-ph/0309347; and Big Bang Nucleosynthesis: Probing the First 20 MinutesarXiv:astro-ph/0307244 R. A. Alpher, H. A. Bethe,...
2 Nakamura et al.: Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying Λ term -1 -0.5 0 0.5 1 1.5 2 2.5 3 log t [sec] -10 -9.5 -9 -8.5 -8 l o g x BDΛ model (B * = −10) BDΛ model (B * = −2.5) Friedmann model Fig. 1. Evolution of the scale ...
Big Bang - Make Love 热度: The Big Bang Theory.ppt 热度: 相关推荐 TheBigBang Necessary? –ExpansionoftheUniverse –OriginofCMBR •400photons/cc •Blackbodytemperatureprofile –Heliumcontent •Universalnucleosynthesis(likeastar) Basics –Universewashotter,denserinthepast Afewassumptions –Universe...
Big Bang Nucleosynthesis refers to the era in the early universe when nucleons combined to form light nuclei, such as deuterium, helium, and lithium, as the primordial plasma cooled down. This process depended on the rates of electromagnetic, weak, and strong interactions, as well as the expan...
The last parameter of big-bang nucleosynthesis, the baryon density, is being pinned down by measurements of the deuterium abundance in high-redshift hydrogen clouds. When it is determined, it will fix the primeval light-element abundances. D, ^3He and ^7Li will become ``tracers'' for the...
The current state of affairs in big-bang nucleosynthesis is reviewed and controversies are discussed. The author concludes that the glass is half full.Turner, M Sdoi:10.1111/j.1749-6632.1984.tb23345.xMICHAEL S. TURNERAstronomy and Astrophysics Center Enrico Fermi Institute The University of ...
We present an overview of the standard model of big bang nucleosynthesis (BBN), which describes the production of the light elements in the early universe. The theoretical prediction for the abundances of D, 3He, 4He, and 7Li is discussed. We emphasize the role of key nuclear reactions and...
Prediction of the primordial abundances of elements in the big-bang nucleosynthesis (BBN) is one of the three strong evidences for the big bang model. Precise knowledge of the baryon-to-photon ratio of the Universe from observations of the anisotropies of cosmic microwave background radiation has...
Bang, the first nuclei were formed through a process called Big Bang Nucleosynthesis. At that time hydrogen and helium were formed and became the building blocks of the first stars. This process is also responsible for the hydrogen/helium ratio of the cosmos, which is observed today [1]...