Results 21 to 30 of about 66,893 (303)
Chaotic amplification of neutrino chemical potentials by neutrino oscillations in big bang nucleosynthesis [PDF]
, 1996 We investigate in detail the parameter space of active-sterile neutrino oscillations that amplifies neutrino chemical potentials at the epoch of Big Bang Nucleosynthesis.
Xiangdong Shi
openalex +4 more sources
Nucleosynthesis and observation of the heaviest elements [PDF]
European Physical Journal A, 2023 The rapid neutron capture or ‘ r process’ of nucleosynthesis is believed to be responsible for the production of approximately half the natural abundance of heavy elements found on the periodic table above iron (with proton number $$Z=26$$ Z = 26 ) and ...
E. Holmbeck, T. Sprouse, M. Mumpower
semanticscholar +1 more source
New models and big bang nucleosynthesis constraints in f(Q) gravity [PDF]
The European Physical Journal C, 2022 The f ( Q ) theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe.
Fotios Anagnostopoulos +3 more
semanticscholar +1 more source
Primordial Nucleosynthesis [PDF]
Journal of Physics: Conference Series, 2013 Invited Plenary Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)
Coc, Alain, Vangioni, Elisabeth
openaire +18 more sources
Post-AGB Stars as Tracers of AGB Nucleosynthesis: An Update
Universe, 2022 The chemical evolution of galaxies is governed by the chemical yields from stars, and here we focus on the important contributions from asymptotic giant branch (AGB) stars. AGB nucleosynthesis is, however, still riddled with complexities.
Devika Kamath, Hans Van Winckel
doaj +1 more source
Neutrino decoupling including flavour oscillations and primordial nucleosynthesis [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We revisit the decoupling of neutrinos in the early universe with flavour oscillations. We rederive the quantum kinetic equations which determine the neutrino evolution based on a BBGKY-like hierarchy, and include for the first time the full collision ...
Julien Froustey, C. Pitrou, M. Volpe
semanticscholar +1 more source
Solar data uncertainty impacts on MCMC methods for r-process nucleosynthesis
Frontiers in Physics, 2022 In recent work, we developed a Markov Chain Monte Carlo (MCMC) procedure to predict the ground state masses capable of forming the observed Solar r-process rare-earth abundance peak.
Nicole Vassh +4 more
doaj +1 more source
Magnetic-buoyancy-induced mixing in AGB stars: Fluorine nucleosynthesis at different metallicities [PDF]
Astronomy & Astrophysics, 2021 Asymptotic giant branch (AGB) stars are considered to be among the most significant contributors to the fluorine budget in our Galaxy. While observations and theory agree at close-to-solar metallicity, stellar models at lower metallicities overestimate ...
D. Vescovi +4 more
semanticscholar +1 more source
The building blocks of the universe
HTS Teologiese Studies/Theological Studies, 2021 I review the state of knowledge of the composition of the universe for a non-specialist audience. The universe is built up of four components. These are radiation, baryonic (ordinary) matter, dark matter and dark energy.
Anslyn J. John
doaj +1 more source
Universe, 2022 Presolar grains are microscopic dust grains that formed in the stellar winds or explosions of ancient stars that died before the formation of the solar system.
Nan Liu, Sergio Cristallo, Diego Vescovi
doaj +1 more source