Search Publications

Exciting dark matter and the INTEGRAL/SPI 511keV signal

Finkbeiner, Douglas P.; Weiner, Neal

We propose a dark matter candidate with an “excited state” 1 2 MeV above the ground state, which may be collisionally excited and deexcites by e⁺e^- pair emission. By converting its kinetic energy into pairs, such a particle could produce a substantial fraction of the 511 keV line observed by the International Gamma-Ray Astrop…

MeV right-handed neutrinos and dark matter

Nezri, E.; Frère, J. -M.; Ling, F. -S. +3 more

We consider the possibility of having an MeV right-handed neutrino as a dark matter constituent. The initial reason for this study was the 511 keV spectral line observed by the satellite experiment INTEGRAL: could it be due to an interaction between dark matter and baryons? Independently of this, we find a number of constraints on the assumed righ…