Asymmetric Dark Matter from Leptogenesis
arXiv:1101.4936 · doi:10.1007/JHEP05(2011)106
Abstract
We present a new realization of asymmetric dark matter in which the dark matter and lepton asymmetries are generated simultaneously through two-sector leptogenesis. The right-handed neutrinos couple both to the Standard Model and to a hidden sector where the dark matter resides. This framework explains the lepton asymmetry, dark matter abundance and neutrino masses all at once. In contrast to previous realizations of asymmetric dark matter, the model allows for a wide range of dark matter masses, from keV to 10 TeV. In particular, very light dark matter can be accommodated without violating experimental constraints. We discuss several variants of our model that highlight interesting phenomenological possibilities. In one, late decays repopulate the symmetric dark matter component, providing a new mechanism for generating a large annihilation rate at the present epoch and allowing for mixed warm/cold dark matter. In a second scenario, dark matter mixes with the active neutrinos, thus presenting a distinct method to populate sterile neutrino dark matter through leptogenesis. At late times, oscillations and dark matter decays lead to interesting indirect detection signals.
32 pages + appendix, references added, minor changes
References in corpus (22)
- Observation of an anomalous positron abundance in the cosmic radiation
- A Theory of Dark Matter
- Leptogenesis
- Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
- New Fixed-Target Experiments to Search for Dark Gauge Forces
- Asymmetric Dark Matter
- CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
- Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
- Decaying Dark Matter can explain the electron/positron excesses
- Hylogenesis: A Unified Origin for Baryonic Visible Matter and Antibaryonic Dark Matter
- Darkogenesis
- Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
- Unified origin of baryons and dark matter
- Aidnogenesis via Leptogenesis and Dark Sphalerons
- The importance of N2 leptogenesis
- The Relic Abundance of Long-lived Heavy Colored Particles
- Cosmological Constraints on Neutrino Injection
- A Unified Theory of Matter Genesis: Asymmetric Freeze-In
- Leptogenesis origin of Dirac gaugino dark matter
- Origins of Hidden Sector Dark Matter II: Collider Physics
- Visible and Dark Matter Genesis and Cosmic Positron/Electron Excesses
- Dark Matter and the Baryon Asymmetry of the Universe