Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456...98m&link_type=abstract
Astrophysical Journal v.456, p.98
Astronomy and Astrophysics
Astronomy
22
Cosmology: Theory, Cosmology: Dark Matter, Cosmology: Early Universe, Nuclear Reactions, Nucleosynthesis, Abundances
Scientific paper
We discuss the upper limit to the baryonic contribution to the closure density. We consider effects of new observational and theoretical uncertainties in the primordial light-element abundances and the effects of fluctuation geometry on the inhomogeneous nucleosynthesis yields. We also consider implications of the possible detection of a high D/H abundance in a Lyman-α absorption cloud at high redshift and the implied chemical evolution effects of a high deuterium abundance. We show that there exists a region of the parameter space for inhomogeneous models in which a somewhat higher baryonic contribution to the closure density is possible than that allowed in standard homogeneous models. This result is contrary to some other recent studies and is due to both geometry and recently revised uncertainties in primordial light-element abundances, particularly 7Li. We find that the presently adopted abundance constraints are consistent with a contribution of baryons to the closure density as high as Ωbh250 ≤ 0.11 (n ≤ 7 × 10-10). This corresponds to a 20% increase over the limit from standard homogeneous models (Ωbh250 ≤ 0.08, η ≤ 5.8 × 10-10). With a high deuterium abundance the upper limits for the inhomogeneous and homogeneous models would be Ωbh250 ≤ 0.04 and 0.03 (η ≤ 2.6 × 10-10 and 1.9 × 10-10), respectively. Even higher limits could be obtained by further relaxing the presently accepted primordial lithium abundance constraint as some have proposed.
Kajino Taka
Mathews Grant J.
Orito Manabu
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