Deuterium and Big Bang Nucleosynthesis

Details Deuterium and Big Bang Nucleosynthesis Deuterium and Big Bang Nucleosynthesis

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nupha.663..861b&link_type=abstract

Nuclear Physics A, Volume 663, p. 861-861.

Physics

Nuclear Physics

4

Scientific paper

Measurements of deuterium absorption in high redshift quasar absorption systems provide a direct inference of the deuterium abundance produced by big bang nucleosynthesis (BBN). With measurements and limits from five independent absorption systems, we place strong constraints on the primordial ratio of deuterium to hydrogen, (D/H)p = 3.4 +/- 0.3 × 10-5 [1,2]. We employ a direct numerical treatment to improve the estimates of critical reaction rates and reduce the uncertainties in BBN predictions of D/H and 7Li/H by a factor of three[3] over previous efforts[4]. Using our measurements of (D/H)p and new BBN predictions, we find at 95% confidence the baryon density ρb = (3.6 +/- 0.4) × 10-31 g cm-3 (Ωbh265 = 0.045 +/- 0.006 in units of the critical density), and cosmological baryon-photon ratio η = (5.1 +/- 0.6) × 10-10.

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