Results 101 to 110 of about 12,181 (205)
Non-Standard Big Bang Nucleosynthesis Scenarios [PDF]
arXiv, 1998 A brief overview of non-standard big bang nucleosynthesis (BBN) scenarios is presented. Trends and results of the light-element nucleosynthesis in BBN scenarios with small-scale or large-scale inhomogeneity, the presence of antimatter domains, stable or unstable massive neutrinos, neutrino oscillations, neutrino degeneracy, or massive decaying ...
arxiv
Neutrinos and Big Bang Nucleosynthesis [PDF]
Nuovo Cim.B117:1081-1088,2003, 2002 The role of neutrinos in big bang nucleosynthesis is discussed. The bounds on the number of neutrino families, neutrino degeneracy, parameters of neutrino oscillations are presented. A model of chemically inhomogeneous, while energetically smooth, universe created by inhomogeneous cosmological neutrino asymmetry is described.
arxiv
, 1999 The current of status of big bang nucleosynthesis is reviewed and the concordance between theory and observation is examined in detail. It is argued that when using the observational data on he4 and li7, the two isotopes whose abundances are least affected by chemical and stellar evolution, both are completely consistent with BBN theory.
openaire +2 more sources
NEUTRINO EFFECTS IN NUCLEOSYNTHESIS [PDF]
Neutrino Physics, 2001 The nucleosynthesis within a Type II supernova occurs in an intense neutrino flux. I discuss some of the effects associated with neutrino interactions, including direct synthesis in the neutrino process, the role of neutrinos in controlling the r-process path and in postprocessing r-process products, and neutrino oscillation connections.
openaire +3 more sources
Nuclear Physics B - Proceedings Supplements, 1995 13 pages, including 4 figures, to appear in the Proceedings of the Workshop on ``Theoretical and Phenomenological Aspects of Underground Physics" (TAUP'95), Suppl. Nucl. Phys. B (M. Fatas, ed.)
openaire +3 more sources
Nucleosynthesis in early supernova winds III: No significant contribution from neutron-rich pockets [PDF]
arXiv, 2007 Recent nucleosynthesis calculations of Type II supernovae using advanced neutrino transport determine that the early neutrino winds are proton-rich. However, a fraction of the ejecta emitted at the same time is composed of neutron-rich pockets. In this paper we calculate the nucleosynthesis contribution from the neutron-rich pockets in the hot ...
arxiv
Neutron Capture Nucleosynthesis [PDF]
arXiv: Solar and Stellar Astrophysics, 2016 6 pages, 3 figures.
openaire +2 more sources
Nucleosynthesis in slowly evolving Cosmologies [PDF]
arXiv, 2008 We explore aspects of Cosmological Nucleosynthesis in an FRW universe in which the scale factor evolves linearly with time: $a(t) \sim t$. A high Lepton number density during the period when significant nucleosynthesis takes place would lead to a dominant screening of the Coulomb potential of colliding nucleii.
arxiv
Big Bang Nucleosynthesis [PDF]
Nuclear Physics B - Proceedings Supplements, 2002 A review of Big Bang Nucleosynthesis (BBN) is presented. Observations of deuterium and helium-4 are discussed. Some BBN restrictions on non-standard physics, especially on neutrino properties and time-variation of fundamental constants are given.
openaire +4 more sources
Big-bang Nucleosynthesis: Is the Glass Half Full or Half Empty? [PDF]
arXiv, 1996 The current state of affairs in big-bang nucleosynthesis is reviewed and controversies are discussed. The author concludes that the glass is half full.
arxiv