2003ApJ...591L.107S

We speculate that the dark halos of dwarf galaxies and low surface brightness galaxies soften their central cusps by the decay of a fraction of cold dark matter (CDM) particles to stable particles with a recoiling velocity of a few tens of kilometers per second, after they have driven the formation of galactic halos. This process, however, does not necessarily produce a significant reduction of the central dark matter density of satellite dwarf spheroidals such as Draco or Fornax. It is shown that the recovered distribution of concentration parameters c for the initial (before decay) Navarro-Frenk-White halos is in good agreement with CDM predictions. Other interesting potentials of unstable CDM are highlighted.