Absence of a Lower Limit on Omega_b in Inhomogeneous Primordial Nucleosynthesis

Details Absence of a Lower Limit on Omega_b in Inhomogeneous Primordial Nucleosynthesis Absence of a Lower Limit on Omega_b in Inhomogeneous Primordial Nucleosynthesis

1994-07-12

arxiv.org/abs/astro-ph/9407035v1

Astrophys.J. 441 (1995) 465-470

Astronomy and Astrophysics

Astrophysics

13 pages, 2 figures (available upon request by email), plain tex

Scientific paper

10.1086/175372

We show that a class of inhomogeneous big bang nucleosynthesis models exist which yield light-element abundances in agreement with observational constraints for baryon-to-photon ratios significantly smaller than those inferred from standard homogeneous big bang nucleosynthesis (HBBN). These inhomogeneous nucleosynthesis models are characterized by a bimodal distribution of baryons in which some regions have a local baryon-to-photon ratio eta=3*10e-10, while the remaining regions are baryon-depleted. HBBN scenarios with primordial (2H+3He)/H<9*10e-5 necessarily require that most baryons be in a dark or non-luminous form, although new observations of a possible high deuterium abundance in Lyman-alpha clouds may relax this requirement somewhat. The models described here present another way to relax this requirement and can even eliminate any lower bound on the baryon-to-photon ratio.

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