Dark matter from late decays and the small-scale structure problems

Francesca Borzumati, Torsten Bringmann, Piero Ullio

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.

Original languageEnglish
Article number063514
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number6
Publication statusPublished - 2008 Mar 12
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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