Dark Matter Annihilation in the Universe
arXiv:1403.4495 · doi:10.1142/S2010194514602567
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 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.
Proceedings of 2nd International Workshop on Antimatter and Gravity WAG 2013 held in Bern on November 13-15 2013
References in corpus (6)
- Observation of an anomalous positron abundance in the cosmic radiation
- CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
- Constraints on WIMP Dark Matter from the High Energy PAMELA data
- Dark matter and the first stars: a new phase of stellar evolution
- The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
- Dark Matter Indirect Signatures