Lithium -7 as a cosmological observable
The present state of the study of the effect of the quark-hadron phase transition on Big-Bang nucleosynthesis (BBN) is reviewed.The following conclusions can be drawn.
Given the uncertainties on the Hubble parameter, the range of Ω b goes from 0.1 to 0.01. This is appreciably larger than in the case of a homogeneous density universe. This does not appear to be large enough to allow the baryons to close the universe(Ωb < 1).
The cosmic density of luminous matter (stars and X-ray cluster gas) is ΩL = 0.01 whitin a factor of two while the density of clustered matter needed to account for the stability of clusters of galaxy or large scale motions is ΩG = 0.1 to 0.2.
Thus, within the uncertainties, at one end of the scale the baryonic matter could be entirely luminous (no baryonic dark matter) while at the other end of the scale the clustered matter could be entirely baryonic (no non-baryonic dark matter).
The comparison between the present calculations and the cosmic abundances suggest that the contrast R between the phases is unlikely to be larger than ten. This result is in agreement with the best estimate of the critical temperature of the phase transition (180 MeV<Tc < 220 MeV) leading to R≈7.
KeywordsDark Matter Baryonic Density Lithium Abundance Neutron Diffusion High Density Phase
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