MeV right-handed neutrinos and dark matter

In a left‐right framework, we study the possibility of a light right‐handed neutrino dark matter candidate. The most stringent constraints come from neutrino experiments on solar neutrino fluxes, suppressing the magnitude of the right‐handed interactions. Despite this constraint we calculate the relic density avoiding over abundance thanks to a very low rehating temperature scenario. The possibility of explaining the Integral 511 keV line is also studied through a dark matter — baryon interaction. If the morphology seems to fit well the shape of the signal, the absolute flux is much too low compared to the experiment measurement.