Results 71 to 80 of about 28,372 (160)
θ-dependence of light nuclei and nucleosynthesis
Physical Review Research, 2020 We investigate the impact of the QCD vacuum at nonzero θ on the properties of light nuclei, Big Bang nucleosynthesis, and stellar nucleosynthesis. Our analysis starts with a calculation of the θ-dependence of the neutron-proton mass difference and ...
Dean Lee +4 more
doaj +1 more source
Improved BBN constraints on the variation of the gravitational constant
European Physical Journal C: Particles and Fields, 2020 Big Bang Nucleosynthesis (BBN) is very sensitive to the cosmological expansion rate. If the gravitational constant G took a different value during the nucleosynthesis epoch than today, the primordial abundances of light elements would be affected.
James Alvey +3 more
doaj +1 more source
The violent Universe: the Big Bang [PDF]
CERN Yellow Report CERN-2010-002, pp.149-196, 2010 Four lectures on Big Bang cosmology, including microwave background radiation, Big Bang nucleosynthesis, dark matter, inflation, and baryogenesis.
arxiv
Constraints on Tsallis Cosmology from Big Bang Nucleosynthesis and the Relic Abundance of Cold Dark Matter Particles. [PDF]
Entropy (Basel), 2023 Jizba P, Lambiase G.
europepmc +1 more source
LiBeB and Big Bang Nucleosynthesis [PDF]
arXiv, 1999 The dual origin of population II Li7, in both big bang nucleosynthesis and galactic cosmic-ray nucleosynthesis is discussed. It is argued that with additional Li6 data, stringent limits on the degree of Li7 depletion can be obtained. Li7 depletion is also constrained by the concordance of big bang predictions with observational determinations of light ...
arxiv
Big Bang: a theory or fact [PDF]
arXivThe discovery and confirmation that some nuclides were formed soon after the Big Bang is one of the strongest arguments in favour of the Hot Big Bang theory. The process of combining protons and neutrons in a hot, expanding universe is known as Big Bang nucleosynthesis (or, occasionally, primordial nucleosynthesis).
arxiv
Big-bang nucleosynthesis constraints on dark-matter sectors revisited [PDF]
arXiv, 2017 We extend previous studies of big bang nucleosynthesis, with the assumption that ordinary matter and dark matter sectors are entangled through the number of degrees of freedom entering the Friedmann equations. This conjecture allows us to find a relation between the temperatures of the weakly interacting matter and dark-matter sectors.
arxiv
86th Annual Meeting of the Meteoritical Society (2024)
Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley +1 more source
Neutrino at Different Epochs of the Friedmann Universe
UniverseAt least two relics of the Big Bang have survived: the cosmological microwave background (CMB) and the cosmological neutrino background (CνB). Being the second most abundant particle in the universe, the neutrino has a significant impact on its evolution
Alexandre V. Ivanchik +2 more
doaj +1 more source
AlterBBN v2: A public code for calculating Big-Bang nucleosynthesis constraints in alternative cosmologies [PDF]
arXiv, 2018 We present the version 2 of AlterBBN, an open public code for the calculation of the abundance of the elements from Big-Bang nucleosynthesis. It does not rely on any closed external library or program, aims at being user-friendly and allowing easy modifications, and provides a fast and reliable calculation of the Big-Bang nucleosynthesis constraints in
arxiv