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A sensitive search for unknown spectral emission lines in the diffuse X-ray background with XMM-Newton

Schmitt, J. H. M. M.; Horns, D.; Gewering-Peine, A.

The Standard Model of particle physics can be extended to include sterile (right-handed) neutrinos or axions to solve the dark matter problem. Depending upon the mixing angle between active and sterile neutrinos, the latter have the possibility to decay into monoenergetic active neutrinos and photons in the keV-range while axions can couple to two…