Search Publications

Light neutralino dark matter in the next-to-minimal supersymmetric standard model

Hooper, Dan; Gunion, John F.; McElrath, Bob

Neutralino dark matter is generally assumed to be relatively heavy, with a mass near the electroweak scale. This does not necessarily need to be the case, however. In the next-to-minimal supersymmetric standard model (NMSSM) and other supersymmetric models with an extended Higgs sector, a very light CP-odd Higgs boson can naturally arise making it…

Continuum γ-ray emission from light dark matter positrons and electrons

Schanne, S.; Sizun, P.; Cassé, M.

The annihilation of light dark matter was recently advocated as a possible explanation of the large positron injection rate at the Galactic center deduced from observations by the SPI spectrometer aboard INTEGRAL. The modelling of internal Bremsstrahlung and in-flight annihilation radiations associated to this process drastically reduced the mass …

Soft gamma-ray background and light dark matter annihilation

Fayet, Pierre; Cordier, Bertrand; Teyssier, Romain +4 more

The bulk of the extragalactic background between 10 keV and 10 GeV is likely to be explained by the emission of Seyfert galaxies, type Ia supernovae, and blazars. However, as revealed by the INTEGRAL satellite, the bulge of our galaxy is an intense source of a 511 keV gamma-ray line, indicating the production of a large number of positrons that an…