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A long time ago (in 2014), in galaxies and galaxy clusters far, far away, several groups have reported hints for a yet unidentified line in astrophysical X-ray signals at an energy of 3.5\,keV.
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D. Cadamuro, Cosmological limits on axions and axion-like particles · 2012
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PhD thesis, Leiden University, February, 2013
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2013
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M. Klasen and C. E. Yaguna, Warm and cold fermionic dark matter via freeze-in
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2013
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2014
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2015
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2015
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J. Baur, N. Palanque-Delabrouille, C. Yèche, C. Magneville, and M. Viel, Lyman-alpha Forests cool Warm Dark Matter · 2015
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M. H. Chan, Can decaying sterile neutrinos account for all dark matter?
2016
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2016
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2016
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2016
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A. Schneider, Astrophysical constraints on resonantly produced sterile neutrino dark matter
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2017
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J. Heeck and D. Teresi, Cold keV dark matter from decays and scatterings
2017
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X. Chu, S. Kulkarni, and P. Salati, Dark matter indirect signals with long-lived mediators
2017
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2017
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S. Clark, JAXA, NASA approve replacement for failed Hitomi astronomy satellite
2017
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2017
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K. N. Abazajian, Detection of Dark Matter Decay in the X-ray
2040
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