Dark Matter via Many Copies of the Standard Model

TL;DR

This paper proposes a cosmological model where multiple copies of the Standard Model explain dark matter, linking baryon abundance and density perturbations during modulated reheating.

Contribution

It introduces a novel scenario with many Standard Model copies, naturally generating dark matter and density perturbations during reheating.

Findings

Hidden-sector baryons can account for dark matter.

Dark matter abundance relates to cosmological parameters.

Model predicts proportionality between dark matter and observable parameters.

Abstract

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.