Cold Positrons from Decaying Dark Matter
arXiv:1206.3076 · doi:10.1103/PhysRevD.86.103520
Abstract
Many models of dark matter contain more than one new particle beyond those in the Standard Model. Often heavier particles decay into the lightest dark matter particle as the Universe evolves. Here we explore the possibilities that arise if one of the products in a (Heavy Particle) (Dark Matter) decay is a positron, and the lifetime is shorter than the age of the Universe. The positrons cool down by scattering off the cosmic microwave background and eventually annihilate when they fall into Galactic potential wells. The resulting 511 keV flux not only places constraints on this class of models but might even be consistent with that observed by the INTEGRAL satellite.
20 pages, 7 figures
References in corpus (16)
- Observation of an anomalous positron abundance in the cosmic radiation
- New results from DAMA/LIBRA
- Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector
- The Tevatron at the Frontier of Dark Matter Direct Detection
- LEP Shines Light on Dark Matter
- Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
- INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
- Reopening the window on charged dark matter
- Stau-catalyzed Li Production in Big-Bang Nucleosynthesis
- Bounds on long-lived charged massive particles from Big Bang nucleosynthesis
- Search for heavy long-lived charged particles in pp collisions at sqrt(s) = 7 TeV
- The galactic 511 keV line from electroweak scale WIMPs
- Implications of Catalyzed BBN in the CMSSM with Gravitino Dark Matter
- Resolving Cosmic Gamma Ray Anomalies with Dark Matter Decaying Now
- Is There a Dark Matter Signal in the Galactic Positron Annihilation Radiation?
- The degenerate gravitino scenario