Cosmological constraints on dark matter models with velocity-dependent annihilation cross section

2011/02/28 by Junji Hisano, Masahiro Kawasaki, Kazunori Kohri +3 · 70 citations
Physics and Astronomy · #Annihilation #Astronomy #Astrophysics #Computer science #Cosmology #Cosmology and Gravitation Theories #Cross section (physics) #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Particle physics #Particle physics theoretical and experimental studies #Physics #Section (typography) #astro-ph.CO #hep-ph

paper · pdf · doi:10.1103/physrevd.83.123511

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 83(12), 123511 (American Physical Society) · 23 pages, 9 figures; Added references

arxiv created 2011/03/20 · openalex publication_date 2011/06/07 · arxiv updated 2015/03/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We derive cosmological constraints on the annihilation cross section of dark matter with velocity-dependent structure, motivated by annihilating dark matter models through Sommerfeld or Breit-Wigner enhancement mechanisms. In models with an annihilation cross section increasing with decreasing dark matter velocity, a big-bang nucleosynthesis and cosmic microwave background give stringent constraints. Particularly, if the cross section is enhanced by a factor larger than 10³, the thermal relic scenario is excluded for the dark matter lighter than O(TeV).

Citations

• Fermi Large Area Telescope Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications
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• The Cosmic Microwave Background Spectrum from the FullCOBEFIRAS Data Set
• Explosive Dark Matter Annihilation
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• SECOND AND THIRD SEASON QUaD COSMIC MICROWAVE BACKGROUND TEMPERATURE AND POLARIZATION POWER SPECTRA
• Energy Spectrum of Cosmic-Ray Electrons at TeV Energies
• A theory of dark matter
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• Big-bang nucleosynthesis and hadronic decay of long-lived massive particles
• Effects of Dark Matter Annihilation on the Cosmic Microwave Background
• A New Calculation of the Recombination Epoch