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...
About three minutes after the Big 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 ...
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, He-3, He-4, and Li-7 is discussed. We emphasize the role of key nuclear ...
Big-bang nucleosynthesis as a probe of cosmology and particle physics The mass fraction of 4He synthesized in the big bang, Y, depends upon the neutron half-life T, the ratio of baryons to photons η, and the number of two-co... KA Olive,DN Schramm,MS Turner,... - 《Astrophysical ...
S. Turner, "Big-Bang Nucleosynthesis: Linking Inner Space and Outer Space," arXiv:9903300 [astro-ph]. http://arxiv.org/abs/astro-ph/9903300.S. Burles, K. M. Nollett, and M. S. Turner. Big-Bang Nucleosynthesis: Linking Inner Space and Outer Space. ArXiv Astrophysics e-prints, ...
Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the Reheating Temperature(SUMMER INSTITUTE 2005) We consider the gravitino problem and derive the constraint on the reheating temperature after inflation. A Yotsuyanagi - 《Soryushiron Kenkyu Electronics》 被引量: 73发表: 2006年 Big...
The calculation of big-bang nucleosynthesis with nonzero lepton numbers is extended to atomic weights less than 12. The observed abundances of D and He-4 place only a lower limit on the present mean baryon density of the Universe: not less than 5 x 10 to the -31st g/cu cm for primordi...
Revised October 2013 by B.D.Fields.(Univ.of Illinois)P.Molaro(Trieste Observatory)and S.Sarkar(Univ.of Oxford&Niels Bohr Institute.Copenhagen).Big-Bang nucleosynthesis(BBN)offers the deepest reliable probe of the early Universe,being based on well-understood Standard Model physics[1].Predictions ...
These messengers from the Big Bang provide a unique window in the early, hot, dense Universe, offering the opportunity for tests of the standard models of particle physics and of cosmology. A new, statistically coherent comparison of the primordial abundances of these nuclides inferred from ...
Lemaître’s work laid the groundwork for the modern Big Bang theory. George Gamow and Ralph Alpher (1940s): Physicist George Gamow and his student Ralph Alpher developed the first detailed version of the Big Bang theory, incorporating concepts like nucleosynthesis to explain the abundance of ...