Non-baryonic Dark Matter as the Source of Gamma Ray Emission in Magnetar

The strong constraint on the baryonic density parameter for the consistency check on the production of light elements in the early universe is the main argument for the existence of non -baryonic dark matter. The non-baryonic dark matter is considered to be made up of neutrinos and axions, where the latter decays into photons in strong magnetic fields. Using the measurements of the anisotropy of the CMB, the spatial distribution of galaxies, one finds a density of non-baryonic dark matter to be. Using the constraint on neutrino density parameter as for massive neutrinos, the neutrino number density calculated from Goldreich- Julian technique is taken as the standard value for their production .The rest of the non-baryonic components, the axions, are then estimated. These axions are believed to power the magnetar gamma ray energy, which agree satisfactorily with the observed values. Magnetars possess ultra high magnetic fields are the potential sources of neutrinos and axions consistent with non baryonic dark matter production elucidated here then give rise to SGRs. For still higher magnetic field the energy production in magnetars may account for even the energy of Gamma ray burst sources (GRBs).