Dark Matter Annihilation in the Universe

Abstract

The astronomical dark matter is an essential component of the Universe and yet its nature is still unresolved. It could be made of neutral and massive elementary particles which are their own antimatter partners. These dark matter species undergo mutual annihilations whose effects are briefly reviewed in this article. Dark matter annihilation plays a key role at early times as it sets the relic abundance of the particles once they have decoupled from the primordial plasma. A weak annihilation cross section naturally leads to a cosmological abundance in agreement with observations. Dark matter species subsequently annihilate - or decay - during Big Bang nucleosynthesis and could play havoc with the light element abundances unless they offer a possible solution to the ${}^7$Li problem. They could also reionize the intergalactic medium after recombination and leave visible imprints in the cosmic microwave background. But one of the most exciting aspects of the question lies in the possibility to indirectly detect the dark matter species through the rare antimatter particles - antiprotons, positrons and anti-deuterons - which they produce as they currently annihilate inside the galactic halo. Finally, the effects of dark matter annihilation on stars is discussed.

arXiv commentProceedings of 2nd International Workshop on Antimatter and Gravity WAG 2013 held in Bern on November 13-15 2013

References in corpus (11)

• Planck 2013 results. XVI. Cosmological parameters
• Observation of an anomalous positron abundance in the cosmic radiation
• Model-independent implications of the e+, e-, anti-proton cosmic ray spectra on properties of Dark Matter
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• CMB constraints on Dark Matter models with large annihilation cross-section
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Dark matter and the first stars: a new phase of stellar evolution
• Big Bang Nucleosynthesis and Particle Dark Matter
• The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
• Dark Stars: a new look at the First Stars in the Universe
• Dark Matter Indirect Signatures

Cited by in corpus (4)

• Search of Dark Matter Annihilation in the Galactic Centre using the ANTARES Neutrino Telescope
• Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC Telescopes
• Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
• Constraining branon dark matter from observations of the Segue 1 dwarf spheroidal galaxy with the MAGIC telescopes