Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-03-12
Phys.Rev.D54:3681-3685,1996
Astronomy and Astrophysics
Astrophysics
10 pages LaTeX (uses ReVTeX), including 3 PostScript figures (uses epsf); Full paper available from ftp://ftp.physics.ox.ac.
Scientific paper
10.1103/PhysRevD.54.R3681
Contrary to a recent claim, the inferred primordial abundances of the light elements are quite consistent with the expectations from standard big bang nucleosynthesis when attention is restricted to direct observations rather than results from chemical evolution models. The number of light neutrino (or equivalent particle) species ($N_\nu$) can be as high as 4.53 if the nucleon-to-photon ratio ($\eta$) is at its lower limit of $1.65 \times 10^{-10}$, as constrained by the upper bound on the deuterium abundance in high redshift quasar absorption systems. Alternatively, with $N_\nu = 3$, $\eta$ can be as high as $8.90 \times 10^{-10}$ if the deuterium abundance is bounded from below by its interstellar value.
Kernan Peter J.
Sarkar Subir
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