Astrophysical signatures of light dark matter

Not so dark matter

Reality

The 511 keV line

Gamma rays

Heat from cold dark matter?

Conclusions



  • What is light dark matter?
    • WIMPs (m > 1 GeV)
    • Light dark matter (m ~ MeV)
    • Warm dark matter (m ~ keV)

  • Why is it interesting?
    • Decay (Hooper and Wang 2004)
    • Annihilation (Boehm et al. 2004)
      • Gamma rays
      • Positrons

  • What does a cosmologist understand?
    • dm -> something real

    • dmA + dmB -> something real

Yago Ascasibar (Astrophysikalisches Institut Potsdam)
XLI Rencontres de Moriond (La Thuile, 24 March 2006)