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Dark Matter particles in the Galactic Center and halo can annihilate or decayinto a pair of neutrinos producing a monochromatic flux of neutrinos. Thespectral feature of this signal is unique and it is not expected from anyastrophysical production mechanism. Its observation would constitute a darkmatter smoking gun signal. We performed the first dedicated search with aneutrino telescope for such signal, by looking at both the angular and energyinformation of the neutrino events. To this end, a total of five years ofIceCube's DeepCore data has been used to test dark matter masses ranging from10~GeV to 40~TeV. No significant neutrino excess was found and upper limits onthe annihilation cross section, as well as lower limits on the dark matterlifetime, were set. The limits reached are of the order of $10^{-24}$~cm$^3/s$for an annihilation and up to $10^{27}$ seconds for decaying Dark Matter. Usingthe same data sample we also derive limits for dark matter annihilation ordecay into a pair of Standard Model charged particles.

Search for neutrino lines from dark matter annihilation and decay with IceCube