  Sterile neutrinos are possible dark matter candidates. We examine here
possible detection mechanisms, assuming that the neutrino has a mass of about
50 keV and couples to the ordinary neutrino. Even though this neutrino is quite
heavy, it is non relativistic with a maximum kinetic energy of 0.1 eV. Thus new
experimental techniques are required for its detection. We estimate the
expected event rate in the following cases: i) Measure electron recoils in the
case of materials with very low electron binding. ii) Low temperature crystal
bolometers. iii) Spin induced atomic excitations at very low temperatures,
leading to a characteristic photon spectrum. iv) Observation of resonances in
antineutrino absorption by a nucleus undergoing electron capture. v) Neutrino
induced electron events beyond the end point energy of beta decaying systems,
e.g. in the tritium decay studied by KATRIN.
