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Baryon-to-dark matter ratio from random angular fields

Research output: Contribution to journalJournal article

Published
Article number025
<mark>Journal publication date</mark>01/2013
<mark>Journal</mark>Journal of Cosmology and Astroparticle Physics
Issue number1
Volume2013
Number of pages12
Publication statusPublished
Original languageEnglish

Abstract

We consider the baryon-to-dark matter ratio in models where the dark matter and baryon densities depend on angular fields theta(d) and theta(b) according to pd and Pb theta. with all values of Od and Ob being equally probable in a given randomly-selected domain. tinder 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 = Omega B/Omega(DM) is purely statistical in nature and is independent of anthropic selection. We compute the probability density function for r as a function of a and i and show that the observed value of the baryon-to-dark matter ratio, r approximate to 1/5, is natural in this framework.