Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-23
Astrophys.J.553:L5-L10,2001
Astronomy and Astrophysics
Astrophysics
5 pages LaTeX file, with 3 figures incorporated (uses emulateapj.sty and epsf). ApJ Letters accepted version
Scientific paper
10.1086/320498
In recent years, upper limits on the cosmic microwave background (CMB) anisotropies combined with predictions made by theories of galaxy formation, have been extremely powerful in ruling out purely baryonic dark matter (BDM) universes. However, it has recently been argued that the absence of a prominent second peak in the anisotropy spectrum measured by the BOOMERanG-98 and MAXIMA-1 experiments seems to favour a $\Lambda$BDM model when combined with standard Big Bang Nucleosynthesis (BBN) constraints. In this {\it Letter}, we further investigate this result showing that, using the CMB data {\it alone}, a purely baryonic adiabatic model of structure formation seems unlikely if the universe is flat ($\Omega=1$). Combining the CMB data with supernova type Ia (SNIa) data renders purely baryonic models inconsistent with flatness at high significance and more than $3 \sigma$ away from both the BBN constraints and the HST key project result $h=0.72 \pm 0.08$. These results indicate that only a radical revision of cosmology with {\it ad hoc} properties could bring baryonic models such as those advocated by MOND enthusiasts back into agreement with current observations.
Griffiths Louise M.
Melchiorri Alessandro
Silk Joseph
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