Light Dark Matter
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Light Dark Matter refers to Dark Matter WIMP candidates with masses in the range of 10 MeV to 1 GeV. These particles are heavier than Warm dark matter and Hot dark matter, but are lighter than the traditional forms of Cold dark matter.
[edit] Motivation
In recent years light dark matter has become popular due in part to the many benefits of the theory. Sub-GeV dark matter has been used to explain the positron excess in the galactic center observed by INTEGRAL, excess gamma rays from the galactic center [1] and extragalactic sources, and the discrepancy between observed dark matter at DAMA and the exclusion of dark matter at CDMS [2].
The main impediment to models with light WIMP is the overwhelming amount of experimental data which has not detected them. The majority of sub-GeV dark matter candidates have been excluded by high-energy particle experiments (ie CERN,Tevatron), and in decays of B-mesons[3].
[edit] References
- ^ J.F.Beacom, N.F.Bell and G.Bertone, ``Gamma-ray constraint on Galactic positron production by MeV dark matter, Phys. Rev. Lett. 94, 171301 (2005) arXiv:astro-ph/0409403.
- ^ P.Gondolo and G.Gelmini, ``Compatibility of DAMA dark matter detection with other searches, Phys. Rev. D 71, 123520 (2005) arXiv:hep-ph/0504010.
- ^ C.Bird, R.Kowalewski and M.Pospelov, ``Dark matter pair-production in b --> s transitions, Mod. Phys. Lett. A 21, 457 (2006) arXiv:hep-ph/0601090.
