Cosmic microwave background constraints on dark matter models of the Galactic center 511 keV signal

2013/01/31 by Andrew R. Frey, Nicholas B. Reid · 1 citation
Physics and Astronomy · #Anisotropy #Annihilation #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Dark matter halo #Electron #Galactic Center #Galactic halo #Galaxy #Halo #Hot dark matter #Light dark matter #Nuclear physics #Particle physics #Physics #Planck #Positron #Quantum mechanics #Scalar field dark matter #astro-ph.CO #astro-ph.GA #hep-ph

paper · pdf · doi:10.1103/physrevd.87.103508

11 pp, 6 figures; v2. added references; v3. 10 pp, shortened review of CMB constraints, version to be published in PRD

arxiv created 2013/05/09 · openalex publication_date 2013/05/15 · arxiv updated 2013/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The high positron production rate required to explain the flux of 511 keV gamma rays from the Galactic center has inspired many models in which dark matter creates positrons. These models include the annihilation of light dark matter and the scattering of dark matter with excited states (exciting dark matter). We show that existing cosmic microwave background data robustly constrain such models when the annihilation or scattering cross section is not velocity suppressed depending on the model of the Galactic dark matter halo. Upcoming data from the Planck mission can exclude the fiducial Via Lactea II halo model, which also provides a good fit to the 511 keV morphology. We additionally find combined constraints on exciting dark matter scattering and annihilation, and update constraints on the lifetimes of dark matter excited states. Finally, we apply constraints to models of dark matter decay in which produced positrons fall into the Galactic center and produce the 511 keV signal on their annihilation, demonstrating that most of the parameter space of interest is ruled out.

Citations

• Effects of dark matter decay and annihilation on the high-redshift 21 cm background
• An asymmetric distribution of positrons in the Galactic disk revealed by γ-rays
• The galactic 511 keV line from electroweak scale WIMPs
• Possible Evidence for MeV Dark Matter in Dwarf Spheroidals
• Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL
• MeV Dark Matter: Has It Been Detected?
• Metastable dark matter mechanisms for INTEGRAL 511 keVγrays and DAMA/CoGeNT events
• The all-sky distribution of 511 keV electron-positron annihilation emission
• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• Exciting dark matter and the INTEGRAL/SPI 511 keV signal
• Abelian dark matter models for 511 keV γ rays and direct detection
• Precise relic WIMP abundance and its impact on searches for dark matter annihilation
• Fermi LAT search for internal bremsstrahlung signatures from dark matter annihilation
• A theory of dark matter
• CMB constraints on dark matter models with large annihilation cross section
• Observing a light dark matter beam with neutrino experiments

Cited by

• Dark matter-neutrino interactions through the lens of their cosmological implications