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- W1816385610 abstract "Observational constraints on the primordial deuterium-to-hydrogen ratio (D/H) can test theories of the early universe and provide constraints on models of big bang nucleosynthesis (BBN). We measure deuterium absorption in high-redshift, metal-poor QSO absorption systems and directly infer the value of primordial D/H. We present two measurements of D/H, and find D/H = 3.3 $pm 0.3 times 10^{-5}$ at $z=3.572$ towards QSO 1937-1009 and D/H = 4.0 $pm 0.7 times 10^{-5}$ at $z=2.504$ towards QSO 1009+2956. Both measurements use multiple-component Voigt profile analysis of high resolution, high signal-to-noise spectra and determinations of the Lyman continuum optical depth in low resolution spectra to constrain the column densities of deuterium and hydrogen. The measurements are consistent with a single primordial value of D/H = $3.4 pm 0.3 times 10^{-5}$. This is a relatively low value, which supports homogeneous models of BBN and standard models of galactic chemical evolution. With standard BBN, we find a cosmological baryon-to-photon ratio, $eta = 5.1 pm 0.3 times 10^{-10}$, and a present-day baryon density in units of the critical density, $Omega_b h_{100}^2 = 0.019 pm 0.001$." @default.
- W1816385610 created "2016-06-24" @default.
- W1816385610 creator A5047959978 @default.
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- W1816385610 date "1998-03-06" @default.
- W1816385610 modified "2023-09-28" @default.
- W1816385610 title "Measurements of the deuterium abundance in quasar absorption systems" @default.
- W1816385610 cites W2791084977 @default.
- W1816385610 hasPublicationYear "1998" @default.
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