Was ordinary matter synthesised from mirror matter? An attempt to explain why ${\Omega }_{Baryon}\approx 0.2{\Omega }_{Dark}$

Abstract

The cosmological dust has begun to settle. A likely picture is a universe comprised (predominantly) of three components: ordinary baryons (${\Omega }_B\approx 0.05$), non-baryonic dark matter (${\Omega }_{Dark}\approx 0.22$) and dark energy (${\Omega }_{\Lambda }\approx 0.7$). We suggest that the observed similarity of the abundances of ordinary baryons and non-baryonic dark matter (${\Omega }_B/{\Omega }_{Dark}\approx 0.20$) 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 ${\Omega }_B/{\Omega }_{Dark}\approx 0.20$ is naturally obtained.

Comments: 6 pages, RevTeX; minor changes and additional explanations; version accepted by Phys Rev D Rapid Communications