Results 91 to 100 of about 12,181 (205)
Primordial Nucleosynthesis: accurate predictions for light element abundances [PDF]
arXiv, 1999 A detailed analysis of primordial nucleosynthesis predictions for light element abundances is performed. Contents: 1. The standard cosmology: an overview. 2. Primordial nucleosynthesis. 3. The Born rates for n<->p reactions. 4. Finite nucleon mass corrections. 5. QED thermal radiative corrections. 6. Calculations of Big Bang Nucleosynthesis. Results.
arxiv
Coulomb screening in linear coasting nucleosynthesis [PDF]
arXiv, 2015 We investigate the impact of coulomb screening on primordial nucleosynthesis in a universe having scale factor that evolves linearly with time. Coulomb screening affects primordial nucleosynthesis via enhancement of thermonuclear reaction rates. This enhancement is determined by the solving Poisson equation within the context of mean field theory ...
arxiv
Explosive nucleosynthesis: prospects [PDF]
Physics Reports, 2000 15 pages, no figures, Elsevier Science volume honoring David N ...
openaire +4 more sources
Alternative Solutions to Big Bang Nucleosynthesis [PDF]
arXiv, 2000 Standard big bang nucleosynthesis (SBBN) has been remarkably successful, and it may well be the correct and sufficient account of what happened. However, interest in variations from the standard picture come from two sources: First, big bang nucleosynthesis can be used to constrain physics of the early universe.
arxiv
Nucleosynthesis bounds on small Dirac neutrino masses due to chiral symmetry breaking [PDF]
arXiv, 1996 We consider nucleosynthesis constraints on models which use chiral symmetry breaking as a basis for understanding very small Dirac neutrino masses. We show that present big-bang nucleosynthesis constraints impose a well-defined upper bound of 0.1eV on the neutrino masses. This bound may become several orders of magnitude more stringent in the future as
arxiv
Nucleosynthesis Without Computer [PDF]
International Journal of Theoretical Physics, 2004 I derive completely analytically the time evolution and final abundances of the light elements (up to Be-7) formed in the big-bang nucleosynthesis.This highlights an interesting physics taking place during the formation of light elements in the early universe.
openaire +3 more sources
From the s-Process to the i-Process: A New Perspective on the Chemical Enrichment of Extrinsic Stars
GalaxiesSeparating stars enriched in the s- and r-processes of nucleosynthesis is usually achieved by analyzing the element ratios of s-process elements (like Ba or La) to r-process elements (like Eu).
Sophie Van Eck +11 more
doaj +1 more source
Cosmological Nucleosynthesis in the Big-Bang and Supernovae [PDF]
arXiv, 2002 Recent observation of the power spectrum of Cosmic Microwave Background (CMB) Radiation has exhibited that the flat cosmology is most likely. This suggests too large universal baryon-density parameter $\Omega_b h^2 \approx 0.022 \sim 0.030$ to accept a theoretical prediction, $\Omega_b h^2 \le 0.017$, in the homogeneous Big-Bang model for primordial ...
arxiv
Recommendations for Monte Carlo nucleosynthesis sampling (Research Note) [PDF]
, 2012 Context: Recent reaction rate evaluations include reaction rate uncertainties that have been determined in a statistically meaningful manner. Furthermore, reaction rate probability density distributions have been determined and published in the form of lognormal parameters with the specific goal of pursuing Monte Carlo nucleosynthesis studies.
arxiv +1 more source
86th Annual Meeting of the Meteoritical Society (2024)
Meteoritics &Planetary Science, Volume 59, Issue S1, Page i-xlii, August 2024.
wiley +2 more sources