Dark Matter via Many Copies of the Standard Model

Understand

We propose a cosmological scenario based on the assumption that the Standard Model possesses a large number of copies.

• It is demonstrated that baryons in the hidden copies of the standard model can naturally account for the dark matter.
• The right abundance of the hidden-sector baryons and the correct spectrum of density perturbations are simultaneously generated during modulated reheating.
• We show that for the natural values of inflaton coupling constants, dictated by unitarity, the dark-matter abundance is predicted to be proportional to the ratio of observed cosmological parameters: the square of the amplitude of cosmological perturbations and the baryon-to-photon number ratio.