Computer Science
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84..127h&link_type=abstract
Space Science Reviews, v. 84, Issue 1/2, p. 127-136 (1998).
Computer Science
13
Scientific paper
Estimates of the deuterium abundance in quasar absorbers are reviewed, including a brief account of incorrect claims published by the author and a brief review of the problem of hydrogen contamination. It is concluded that the primordial abundance may be universal with a value (D/H)P ~ 10-4, within about a factor of two, corresponding to $$\Omega _Bh_{0.7}^2$$ ~ 0.02 or eta10 ~ 2.7 in the Standard Big Bang. This agrees with current limits on primordial helium, YP <= 0.243, which are shown to be surprisingly insensitive to models of stellar enrichment. It also agrees with a tabulated sum of the total density of baryons in observed components. Much lower primordial deuterium (~ 2 x 10-5) is also possible but disagrees with currently estimated helium abundances; the larger baryon density in this case fits better with current models of the Lyman-alpha forest but requires the bulk of the baryons to be in some currently uncounted form.
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