Semi-annihilation of Dark Matter

Abstract

We show that the thermal relic abundance of dark matter can be affected by a new type of reaction: semi-annihilation. Semi-annihilation takes the schematic form X_i X_j -> X_k phi, where X_i are stable dark matter particles and phi is an unstable state. Such reactions are generically present when dark matter is composed of more than one species with "flavor" and/or "baryon" symmetries. We give a complete set of coupled Boltzmann equations in the presence of semi-annihilations, and study two toy models featuring this process. Semi-annihilation leads to non-trivial dark matter dynamics in the early universe, often dominating over ordinary annihilation in determining the relic abundance. This process also has important implications for indirect detection experiments, by enriching the final state spectrum from dark matter (semi-)annihilation in the Milky Way.

35 pages, 12 figures, 4 tables; v2, references added; v3, version published in JHEP

References in corpus (20)

• Observation of an anomalous positron abundance in the cosmic radiation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Secluded WIMP Dark Matter
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Cosmology and Astrophysics of Minimal Dark Matter
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• The WIMPless Miracle: Dark Matter Particles without Weak-scale Masses or Weak Interactions
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Heavy Dark Matter Through the Higgs Portal
• Dark Matter Interpretations of the Electron/Positron Excesses after FERMI
• Abelian Hidden Sectors at a GeV
• High-energy antiprotons from old supernova remnants
• Confined hidden vector dark matter
• Dark Matter Signals from Cascade Annihilations
• Z_3 Dark Matter and Two-Loop Neutrino Mass
• Decaying Dark Matter in Light of the PAMELA and Fermi LAT Data
• Intense Gamma-Ray Lines from Hidden Vector Dark Matter Decay
• Can we discover dual-component thermal WIMP dark matter?
• Clumpiness enhancement of charged cosmic rays from dark matter annihilation with Sommerfeld effect

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