Dark Matter from Early Decays

Details Dark Matter from Early Decays Dark Matter from Early Decays

2005-07-13

arxiv.org/abs/astro-ph/0507300v2

Phys.Rev.D72:063510,2005

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in PRD. Added a paragraph to Sec V. 9 pages, 3 figures

Scientific paper

10.1103/PhysRevD.72.063510

Two leading dark matter candidates from supersymmetry and other theories of physics beyond the standard model are WIMPs and weak scale gravitinos. If the lightest stable particle is a gravitino, then a WIMP will decay into it with a natural lifetime of order a month ~ M_{pl}^2/M_{weak}^3. We show that if the bulk of dark matter today came from decays of neutral particles with lifetimes of order a year or smaller, then it could lead to a reduction in the amount of small scale substructure, less concentrated halos and constant density cores in the smallest mass halos. Such beneficial effects may therefore be realized naturally, as discussed by Cembranos, Feng, Rajaraman, and Takayama, in the case of supersymmetry.

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