Distinctive signals of boosted dark matter from its semi-annihilation

Abstract

Boosted dark matter can be produced by some mechanism and detecting it is a key to understand the nature of dark matter. We show that the semi-annihilation χχ → χν indicates signals distinctive from the other semi-annihilation and standard dark matter annihilation processes. Since the boosted dark matter produced by this semi-annihilation is regarded as a high energy neutrino, the total flux of the dark matter and the accompanying neutrino yields double peaks at the energy close to the dark matter mass. Both of the particles can be detectable at large volume neutrino detectors.

Semi-annihilating dark matter coupled with Majorons

“…The self-heating of dark matter by semiannihilations also affects the calculation of the thermal relic abundance [9]. In addition, semi-annihilations produce (semi-)relativistic boosted dark matter in galaxies and exhibit distinctive signatures not induced by canonical WIMPs [10,11].…”