Thank you, I look forward to your first draft.
The early discussion was in our review with Zeldovich:
Ya.B.Zeldovich, M.Yu.Khlopov
Mass of neutrino in particle physics and cosmology of early Universe. Usp.
Fiz. Nauk (1981) V. 135, PP. 45-74. [English translation:
Sov. Phys. Uspekhi (1981) V.24, PP.755-774]
You can find useful information in:
Canetti, L., Drewes, M., Shaposhnikov, M.(2013) Sterile Neutrinos as the Origin of Dark and Baryonic Matter. {\em Phys.Rev.Lett.} 110, 061801
Boyarsky, A., Drewes, M., Lasserre, T., Mertens, S., Ruchayskiy, O. (2019) Sterile neutrino Dark Matter. {\em Prog. Part. Nucl. Phys.} 104, 1–45.
Bulbul, E., Markevitch, M., Foster, A., Smith,R. K., Loewenstein, M., Randall,S. W. (2014) Detection of An Unidentified Emission Line in the Stacked X-ray spectrum of Galaxy Clusters. {\em Astrophys. J.} 789, 13. .
https://doi:10.1088/0004-637X/789/1/13 Ruchayskiy, O., Boyarsky, A. Iakubovskyi, D., Bulbul, E., Eckert, D., Franse, J., Maly-shev, D., Markevitch, M., Neronov, A. (2016) Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal, {\em Mon. Not. Roy. Astron. Soc.} 460 (2), 1390–1398.
https://doi:10.1093/mnras/stw1026.