Abstract
We investigate, in the context of asymmetric dark matter (DM), a new mechanism of spontaneous co-genesis of linked DM and baryon asymmetries, explaining the observed relation between the baryon and DM densities, ΩDM /ΩB ≃ 5. The co-genesis mechanism requires a light scalar field, ϕ, with mass below 5 eV which couples derivatively to DM, much like a 'dark axion'. The field ϕ can itself provide a final state into which the residual symmetric DM component can annihilate away.
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