2010/11/29 by Abraham Loeb, Neal Weiner · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #astro-ph.GA #hep-ph
paper · pdf · doi:10.1103/physrevlett.106.171302
published as Phys.Rev.Lett.106:171302,2011 · 6 pages, 2 figures
arxiv created 2010/11/29 · openalex publication_date 2011/04/28 · arxiv updated 2011/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
We show that cold dark matter particles interacting through a Yukawa potential could naturally explain the recently observed cores in dwarf galaxies without affecting the dynamics of objects with a much larger velocity dispersion, such as clusters of galaxies. The velocity dependence of the associated cross section as well as the possible exothermic nature of the interaction alleviates earlier concerns about strongly interacting dark matter. Dark matter evaporation in low-mass objects might explain the observed deficit of satellite galaxies in the Milky Way halo and have important implications for the first galaxies and reionization.