Search Publications

Axion dark matter from lepton flavor-violating decays

Panci, Paolo; Redigolo, Diego; Schwetz, Thomas +1 more

We propose simple scenarios where lepton flavor-violating couplings generate the observed dark matter abundance through freeze-in of an axion-like particle with mass in the few keV range. Compared to flavor-diagonal freeze-in, this mechanism enhances dark matter stability, softens stellar cooling constraints and improves the experimental sensitivi…

MeV gamma-ray constraints for light dark matter from semi-annihilation

Guo, Jun; Zhu, Bin; Wu, Lei

Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally. We assume that the light dark matter is composed of complex scalars and produced from semi-annihilation, which is close to the scale of the MeV Gamma-ray satellite, allowing us to exp…

Light dark matter annihilations into two photons

Boehm, C.; Orloff, J.; Salati, P.

We compute the pair annihilation cross section of light (spin-0) dark matter particles into two photons and discuss the detectability of the monochromatic line associated with these annihilations.

Unstable relics as a source of galactic positrons

Pospelov, Maxim; Picciotto, Charles

We calculate the fluxes of 511 keV photons from the galactic bulge caused by positrons produced in the decays of relic particles with masses less than 100 MeV. In particular, we tighten the constraints on sterile neutrinos over a large domain of the mass-mixing angle parameter space, where the resulting photon flux would significantly exceed the e…