Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-27
PoS IDM2010:083,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 4 figures, 1 table - Talk presented at "Identification of Dark Matter 2010," July 26-30, 2010, Montpellier, France
Scientific paper
The semi-annihilation reaction takes the schematic form psi_i psi_j -> psi_k phi, where psi_i are stable dark matter particles and phi is an unstable state. Such reactions are allowed when dark matter is stabilized by a larger symmetry than just Z_2. They lead to non-trivial dark matter dynamics in the early universe, and the thermal production of the relic particles can be completely controlled by semi-annihilations. This process might also take place today in the Milky Way, enriching the (semi-)annihilation final state spectrum observed in indirect detection experiments.
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