Early Universe and Big Bang Nucleosynthesis

1990 ◽  
pp. 259-299
Author(s):  
N. C. Rana
Keyword(s):  
Early Universe ◽  
Big Bang ◽  
Big Bang Nucleosynthesis

scholarly journals Impact of neutrino properties and dark matter on the primordial Lithium production

2019 ◽  
Vol 28 (08) ◽  
pp. 1950065 ◽  
Author(s):  
Tahani R. Makki ◽  
Mounib F. El Eid ◽  
Grant J. Mathews
Keyword(s):  
Dark Matter ◽  
Early Universe ◽  
Nuclear Physics ◽  
Big Bang ◽  
Light Elements ◽  
Big Bang Nucleosynthesis ◽  
Chemical Potentials ◽  
The Creation ◽  
The Universe

The light elements and their isotopes were produced during standard big bang nucleosynthesis (SBBN) during the first minutes after the creation of the universe. Comparing the calculated abundances of these light species with observed abundances, it appears that all species match very well except for lithium (7Li) which is overproduced by the SBBN. This discrepancy is rather challenging for several reasons to be considered on astrophysical and on nuclear physics ground, or by invoking nonstandard assumptions which are the focus of this paper. In particular, we consider a variation of the chemical potentials of the neutrinos and their temperature. In addition, we investigated the effect of dark matter on 7Li production. We argue that including nonstandard assumptions can lead to a significant reduction of the 7Li abundance compared to that of SBBN. This aspect of lithium production in the early universe may help to resolve the outstanding cosmological lithium problem.

scholarly journals Alternative Solutions to Big Bang Nucleosynthesis

2000 ◽  
Vol 198 ◽  
pp. 25-34 ◽  
Author(s):  
Hannu Kurki-Suonio
Keyword(s):  
Neutrino Physics ◽  
Early Universe ◽  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
Standard Picture ◽  
Alternative Solutions

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. Second, there may be some discrepancy between predictions of SBBN and observations of abundances. Various alternatives to SBBN include inhomogeneous nucleosynthesis, nucleosynthesis with antimatter, and nonstandard neutrino physics.

BBN AND NEUTRINO OSCILLATIONS IN THE EARLY UNIVERSE: A BRIEF REVIEW

2005 ◽  
Vol 20 (11) ◽  
pp. 2431-2435
Author(s):  
F. L. VILLANTE
Keyword(s):  
Early Universe ◽  
Neutrino Oscillations ◽  
Sterile Neutrino ◽  
Big Bang ◽  
Big Bang Nucleosynthesis

We briefly review the physics of Big Bang Nucleosynthesis (BBN). We present, moreover, some recent results on active-sterile neutrino oscillations in the early universe and on their effects on BBN.

scholarly journals Neutrino oscillations and the early universe

Open Physics ◽  
2004 ◽  
Vol 2 (3) ◽  
Author(s):  
Daniela Kirilova
Keyword(s):  
Early Universe ◽  
Neutrino Oscillation ◽  
Neutrino Oscillations ◽  
Atmospheric Neutrino ◽  
Short Review ◽  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
Cosmological Constraints ◽  
Theoretical Status

AbstractThe observational and theoretical status of neutrino oscillations in connection with solar and atmospheric neutrino anomalies is presented briefly. The effect of neutrino oscillations on the evolution of the early Universe is discussed in detail. A short review is given of the standard Big Bang Nucleosynthesis (BBN) and the influence of resonant and non-resonant neutrino oscillations on active neutrinos and on primordial synthesis of He-4. BBN cosmological constraints on neutrino oscillation parameters are discussed.

scholarly journals Probing dark photons in the early universe with big bang nucleosynthesis

2020 ◽  
Vol 2020 (12) ◽  
pp. 049-049
Author(s):  
Jung-Tsung Li ◽  
George M. Fuller ◽  
Evan Grohs
Keyword(s):  
Early Universe ◽  
Big Bang ◽  
Big Bang Nucleosynthesis
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