Asymmetric Dark Matter via Spontaneous Co-Genesis

Details Asymmetric Dark Matter via Spontaneous Co-Genesis Asymmetric Dark Matter via Spontaneous Co-Genesis

2011-06-21

arxiv.org/abs/1106.4319v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages incl refs, 4 figures. v2 references updated and section on DM annihilation extended

Scientific paper

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, Omega_DM/Omega_B ~ 5. The co-genesis mechanism requires a light scalar field, phi, with mass below 5 eV which couples derivatively to DM, much like a `dark axion'. The field phi can itself provide a final state into which the residual symmetric DM component can annihilate away.

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