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A high deuterium abundance at redshift z = 0.7

Ferlet, R.; Vidal-Madjar, A.; Lemoine, M. +4 more

Of the light elements, the primordial abundance of deuterium relative to hydrogen, (D/H)_p, provides the most sensitive diagnostic for the cosmological mass density parameter, Ω_B. Recent high-redshift D/H measurements are highly discrepant, although this may reflect observational uncertainties,. The larger primordial D/H value…