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Right-handed neutrinos with MeV to GeV mass are very promising candidates fordark matter (DM). Not only can they solve the missing satellite puzzle, thecusp-core problem of inner DM density profiles, and the too-big-to failproblem, {\it i.e.} that the unobserved satellites are too big to not havevisible stars, but they can also account for the Standard Model (SM) neutrinomasses at one loop. We perform a comprehensive study of the right-handedneutrino parameter space and impose the correct observed relic density and SMneutrino mass differences and mixings. We find that the DM masses are inagreement with bounds from big-bang nucleosynthesis, but that these constraintsinduce sizeable DM couplings to the charged SM leptons. We then point out thatpreviously overlooked limits from current and future lepton flavour violationexperiments such as MEG and SINDRUM heavily constrain the allowed parameterspace. Since the DM is leptophilic, we also investigate electron recoil as apossible direct detection signal, in particular in the XENON1T experiment. Wefind that despite the large coupling and low backgrounds, the energy thresholdsare still too high and the predicted cross sections too low due to the heavycharged mediator, whose mass is constrained by LEP limits.

MeV neutrino dark matter: Relic density, lepton flavour violation and electron recoil