Abstract
We consider the baryon-to-dark matter ratio in models where the dark matter and baryon densities depend on angular fields θd and θb according to ρd∝θdα and ρb∝θbβ, with all values of θd and θb being equally probable in a given randomly-selected domain. Under the assumption that anthropic selection depends primarily on the baryon density in galaxies at spherical collapse, we show that the probability density function for the baryon-to-dark matter ratio r = ΩB/ΩDM is purely statistical in nature and is independent of anthropic selection. We compute the probability density function for r as a function of α and β and show that the observed value of the baryon-to-dark matter ratio, r ≈ 1/5, is natural in this framework.
Export citation and abstract BibTeX RIS