We study the primordial nucleosynthesis and cosmic age in the presence of a net lepton asymmetry as well as baryon asymmetry. We explore a previously unnoted region of the parameter space in which very large baryon densities 0.1 ≤ Ωb ≤ 1 can be accommodated within the light-element constraints from primordial nucleosynthesis. This parameter space consists of νμ and ντ degeneracies with a small ...

Abstract. Using a time-dependent Galactic Cosmic Ray flux proportional to the halo Star Formation Rate and including astration and neutrino-induced nucleosynthesis, we have studied the evolution of lithium, beryllium and boron in the halo. Our results set limits to the production of LiBeB by the neutrino-induced nucleosynthesis in massive stars, in order to reproduce the observed constancy of B...

We calculate primordial abundances of light elements produced during big bang nucleosynthesis when the fine structure constant and/or the cosmic expansion rate take non-standard values. We compare them with the recent values of observed D, He and Li abundances, which show slight inconsistency among themselves in the standard big bang nucleosynthesis scenario. This inconsistency is not solved by...

Estimates of the relative abundances of the elements in the solar system played an important role in establishing the malor processes of stellar nucleosynthesis Subsequently, it became legitimate to use nucleosynthesis methods to interpolate poorly known elemental abundances, but the experimental database has steadily improved and interpolation is less necessary now fThe SCI® indicates that thi...

We consider the effect of a small-scale matter-antimatter domain structure on big bang nucleosynthesis and place upper limits on the amount of antimatter in the early universe. For small domains, which annihilate before nucleosynthesis, this limit comes from underproduction of 4He. For larger domains, the limit comes from 3He overproduction. Since most of the 3He from &pmacr; 4He annihilation a...

The dual origin of population II 7Li, in both big bang nucleosynthesis and galactic cosmic-ray nucleosynthesis is discussed. It is argued that with additional 6Li data, stringent limits on the degree of 7Li depletion can be obtained. 7Li depletion is also constrained by the concordance of big bang predictions with observational determinations of light element abundances. Stringent limits can al...

Estimates of the relative abundances of the elements in the solar system played an important role in establishing the malor processes of stellar nucleosynthesis Subsequently, it became legitimate to use nucleosynthesis methods to interpolate poorly known elemental abundances, but the experimental database has steadily improved and interpolation is less necessary now fThe SCI® indicates that thi...

Baryonic outflows from proto-neutron stars formed in core-collapse supernova explosions are one of the possible scenarios for the production of heavy elements via the r-process. If the ejected matter reaches supersonic velocities the outflow is known as neutrino-driven wind. We have studied the long-time evolution of proto-neutron stars with oneand two-dimensional hydrodynamical simulations and...

In a previous paper (Serna & Alimi 1996b), we have pointed out the existence of some particular scalar-tensor gravity theories able to relax the nucleosynthesis constraint on the cosmic baryonic density. In this paper, we present an exhaustive study of primordial nucleosynthesis in the framework of such theories taking into account the currently adopted observational constraints. We show that a...

The nucleosynthesis of proton-rich isotopes is calculated for multi-dimensional Chandrasekhar-mass models of Type Ia supernovae with different metallicities. The predicted abundances of the short-lived radioactive isotopes Nb, Tc, and Sm are given in this framework. The abundance seeds are obtained by calculating s-process nucleosynthesis in the material accreted onto a carbon-oxygen white dwar...