2005/07/31 by Manoj Kaplinghat · 170 citations
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Gravitino #Light dark matter #Lightest Supersymmetric Particle #Massive particle #Neutralino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Scalar field dark matter #Substructure #Supergravity #Supersymmetry #WIMP #Warm dark matter #Weakly interacting massive particles #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.72.063510
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 72(6) (American Physical Society) · Matches version accepted for publication in PRD. Added a paragraph to Sec V. 9 pages, 3 figures
arxiv created 2005/09/09 · openalex publication_date 2005/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 \ensuremath∼Mpl2/Mweak3. 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.