Inhomogeneous Big Bang Nucleosynthesis Revisited

Abstract

We reanalyze the allowed parameters for inhomogeneous big bang nucleosynthesis in light of the WMAP constraints on the baryon-to-photon ratio and a recent measurement which has set the neutron lifetime to be 878.5 +/- 0.7 +/- 0.3 seconds. For a set baryon-to-photon ratio the new lifetime reduces the mass fraction of He4 by 0.0015 but does not significantly change the abundances of other isotopes. This enlarges the region of concordance between He4 and deuterium in the parameter space of the baryon-to-photon ratio and the IBBN distance scale. The Li7 abundance can be brought into concordance with observed He4 and deuterium abundances by using depletion factors as high as 9.3. The WMAP constraints, however, severely limit the allowed comoving (T = 100 GK) inhomogeneity distance scale to (1.3 - 2.6)x10^5 cm.

11 pages, 4 figures, More references were added on 4/14/06

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Cited by in corpus (17)

• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• The Deuterium to Hydrogen Abundance Ratio Towards the QSO SDSS1558-0031
• Frontiers in Nuclear Astrophysics
• On Possible Variation in the Cosmological Baryon Fraction
• Big Bang Nucleosynthesis with an Inhomogeneous Primordial Magnetic Field Strength
• Introduction to Big Bang Nucleosynthesis and Modern Cosmology
• Baryon isocurvature constraints on the primordial hypermagnetic fields
• Dynamical Systems analysis of an interacting dark energy model in the Brane Scenario
• Do primordial Lithium abundances imply there's no Dark Energy?
• Big-Bang nucleosynthyesis: constraints on nuclear reaction rates, neutrino degeneracy, inhomogeneous and Brans-Dicke models
• Constraining Density Fluctuations with Big Bang Nucleosynthesis in the Era of Precision Cosmology
• The first spectral line surveys searching for signals from the Dark Ages
• Solving the large discrepancy between inclusive and exclusive measurements of the ${}^8\mathrm{Li}+{}^4\mathrm{He}\to {}^{11}\mathrm{B}+n$ reaction cross section at astrophysical energies
• Spherically symmetric cosmological spacetimes with dust and radiation - numerical implementation
• Multiple Main Sequence of Globular Clusters as a Result of Inhomogeneous Big Bang Nucleosynthesis
• Does inhomogeneous big bang nucleosynthesis produce an inhomogeneous element distribution today?
• Carbon in the pregalactic epoch and the search for the first haloes