Predicting Big Bang Deuterium

Details Predicting Big Bang Deuterium Predicting Big Bang Deuterium

1994-12-22

arxiv.org/abs/astro-ph/9412087v2

Astrophys.J. 458 (1996) 637

Astronomy and Astrophysics

Astrophysics

Revised version of paper to reflect comments of the referee and reply to suggestions of Copi, Schramm, and Turner regarding th

Scientific paper

10.1086/176845

We present new upper and lower bounds to the primordial abundances of deuterium and helium-3 based on observational data from the solar system and the interstellar medium. Independent of any model for the primordial production of the elements we find (at the 95\% C.L.): $1.5 \times 10^{-5} \le (D/H)_P \le 10.0 \times 10^{-5}$ and $(^3He/H)_P \le 2.6\times 10^{-5}$. When combined with the predictions of standard big bang nucleosynthesis, these constraints lead to a 95\% C.L. bound on the primordial abundance of deuterium: $(D/H)_{best} = (3.5^{+2.7}_{-1.8})\times 10^{-5}$. Measurements of deuterium absorption in the spectra of high redshift QSOs will directly test this prediction. The implications of this prediction for the primordial abundances of helium-4 and lithium-7 are discussed, as well as those for the universal density of baryons.

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