Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-04
JCAP 0607:010,2006
Astronomy and Astrophysics
Astrophysics
7 pages, 4 figures, includes results of 3 years of WMAP observations
Scientific paper
10.1088/1475-7516/2006/07/010
Stable particle dark matter may well originate during the decay of long-lived relic particles, as recently extensively examined in the cases of the axino, gravitino, and higher-dimensional Kaluza-Klein (KK) graviton. It is shown that in much of the viable parameter space such dark matter emerges naturally warm/hot or mixed. In particular, decay produced gravitinos (KK-gravitons) may only be considered cold for the mass of the decaying particle in the several TeV range, unless the decaying particle and the dark matter particle are almost degenerate. Such dark matter candidates are thus subject to a host of cosmological constraints on warm and mixed dark matter, such as limits from a proper reionisation of the Universe, the Lyman-alpha forest, and the abundance of clusters of galaxies.. It is shown that constraints from an early reionsation epoch, such as indicated by recent observations, may potentially limit such warm/hot components to contribute only a very small fraction to the dark matter.
Jedamzik Karsten
Lemoine Martin
Moultaka Gilbert
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