Results 141 to 150 of about 41,842 (275)

Absence of a Lower Limit on Omega_b in Inhomogeneous Primordial Nucleosynthesis

, 1994
We show that a class of inhomogeneous big bang nucleosynthesis models exist which yield light-element abundances in agreement with observational constraints for baryon-to-photon ratios significantly smaller than those inferred from standard homogeneous ...
Fuller, G. M., Jedamzik, K., Mathews, G. J.   +2 more
core   +1 more source

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, Ulf-G. Meißner, Keith A. Olive, Mikhail Shifman, Thomas Vonk   +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, Nashwan Sabti, Miguel Escudero, Malcolm Fairbairn   +3 more
doaj   +1 more source

Big-bang nucleosynthesis revisited [PDF]

The homogeneous big-bang nucleosynthesis yields of D, He-3, He-4, and Li-7 are computed taking into account recent measurements of the neutron mean-life as well as updates of several nuclear reaction rates which primarily affect the production of Li-7 ...
Olive, Keith A., Schramm, David N., Steigman, Gary, Walker, Terry P.   +3 more
core   +1 more source

Big Bang Nucleosynthesis: Consistency or Crisis? [PDF]

, 1995
The early, hot, dense, expanding Universe was a primordial reactor in which the light nuclides D, 3He, 4He and 7Li were synthesized in astrophysically interesting abundances. The challenge to the standard hot big bang model (Big Bang Nucleosynthesis = BBN) is the comparison between the observed and predicted abundances, the latter which depend only on ...
openaire   +3 more sources

On the Galactic Evolution of $D$ and $^3He$

, 1993
The determined abundances of primordial $^4He$ and $^7Li$ provide a basis with which to test the standard model of big bang nucleosynthesis in conjunction with the other two light element isotopes $D$ and $^3He$, also produced in the big bang.
Olive, Keith A., Prantzos, Nikos, Vangioni-Flam, Elisabeth   +2 more
core   +2 more sources

From (p)reheating to nucleosynthesis

, 2001
This article gives a brief qualitative description of the possible evolution of the early Universe between the end of an inflationary epoch and the end of Big Bang nucleosynthesis.
Bergstrom L, Birrell N D, Bonifacio P, Bringmann T, Börner G, de Bernardis P, Felder G, Finelli F, Giudice G F, Gruenwald R, Hawking S W, Jedamzik K, Jedamzik K, Karsten Jedamzik, Kolb E W, Kolb E W, Kurki-Suonio H, Kusenko A, Kuzmin V A, Langlois D, Lasenby A, Lasserre T, Levshakov S A, Liddle A, Peloso M, Pryke C, Sarkar S, Sauer D, Stompor R, Tytler D, Wands D, Zel'dovich Ya B   +31 more
core   +1 more source

Mirror matter can alleviate the cosmological lithium problem

, 2013
The abundance of lithium-7 confronts cosmology with a long lasting problem between the predictions of standard big bang nucleosynthesis and the baryonic density determined from the cosmic microwave background observations.
Coc, Alain, Uzan, Jean-Philippe, Vangioni, Elisabeth   +2 more
core   +3 more sources

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Big Bang nucleosynthesis

One of the most compelling pieces of evidence of the Hot Big Bang model is the realisation and confirmation that some nuclides were created shortly after the Big Bang. This process is referred to as Big Bang nucleosynthesis (or, sometimes, primordial nucleosynthesis), and is the end-product of putting neutrons and protons in a hot, expanding Universe ...
openaire   +2 more sources