Was ordinary matter synthesized from mirror matter?: An attempt to explain why ΩB≈0.2Ωdark -: art. no. 021304

The cosmological dust has begun to settle. A likely picture is a universe comprised (predominantly) of three components: ordinary baryons (Omega(B)approximate to0.05), nonbaryonic dark matter (Omega(dark)approximate to0.22) and dark energy (Omega(A)approximate to0.7). We suggest that the observed similarity of the abundances of ordinary baryons and nonbaryonic dark matter (Omega(B)/Omega(dark)approximate to0.20) hints at an underlying similarity between the fundamental properties of ordinary and dark matter particles. This is necessarily the case if dark matter is identified with mirror matter. We examine a specific mirror matter scenario where (Omega(B)/Omega(dark)approximate to0.20) is naturally obtained.