A Parallel World in the Dark

Abstract

The baryon-dark matter coincidence is a long-standing issue. Interestingly, the recent observations suggest the presence of dark radiation, which, if confirmed, would pose another coincidence problem of why the density of dark radiation is comparable to that of photons. These striking coincidences may be traced back to the dark sector with particle contents and interactions that are quite similar, if not identical, to the standard model: a dark parallel world. It naturally solves the coincidence problems of dark matter and dark radiation, and predicts a sterile neutrino(s) with mass of $\mathcal{O}(0.1-1)$\,eV, as well as self-interacting dark matter made of the counterpart of ordinary baryons. We find a robust prediction for the relation between the abundance of dark radiation and the sterile neutrino, which can serve as the smoking-gun evidence of the dark parallel world.

25 pages, 1 figure; version2: Discussion on dark matter improved, references added and typo corrected

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Cited by in corpus (18)

• Self-Interacting Dark Matter from a Non-Abelian Hidden Sector
• Mirror dark matter: Cosmology, galaxy structure and direct detection
• Composite strongly interacting dark matter
• The Scale of Dark QCD
• A new life for sterile neutrinos: resolving inconsistencies using hot dark matter
• SIMPle Dark Matter: Self-Interactions and keV Lines
• Exothermic Double-Disk Dark Matter
• The Cosmophenomenology of Axionic Dark Radiation
• Axion monodromy inflation with multi-natural modulations
• Asymmetric Dark Matter and the hadronic spectra of hidden QCD
• Direct and indirect detection of dissipative dark matter
• Nonthermal production of dark radiation and dark matter
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• Daughters mimic sterile neutrinos (almost!) perfectly
• MSSM with $m_h=125$ GeV in High-Scale Gauge Mediation