Explaining $\hat{I}{\text{c◯}}_{Baryon}\approx 0.2\hat{I}{\text{c◯}}_{Dark}$ through the synthesis of ordinary matter from mirror matter: a more general analysis

Abstract

The emerging cosmological picture is of a spatially flat universe composed predominantly of three components: ordinary baryons ($\hat{I}{\text{c◯}}_B\approx 0.05$), non-baryonic dark matter ($\hat{I}{\text{c◯}}_{Dark}\approx 0.22$) and dark energy ($\hat{I}{\text{c◯}}_{\hat{I}}›\approx 0.7$). We recently proposed that ordinary matter was synthesised from mirror matter, motivated by the argument that the observed similarity of $\hat{I}{\text{c◯}}_B$ and $\hat{I}{\text{c◯}}_{Dark}$ suggests an underlying similarity between the fundamental properties of ordinary and dark matter particles. In this paper we generalise the previous analysis by considering a wider class of effective operators that non-gravitationally couple the ordinary and mirror sectors. We find that while all considered operators imply $\hat{I}{\text{c◯}}_{Dark}=$ few$\times \hat{I}{\text{c◯}}_B$, only a subset quantitatively reproduce the observed ratio $\hat{I}{\text{c◯}}_B/\hat{I}{\text{c◯}}_{Dark}\approx 0.20$. The $\sim 1$ eV mass scale induced through these operators hints at a connection with neutrino oscillation physics.

minor changes, some references added, about 10 pages