Sterile neutrino fits to dark matter mass profiles in the Milky Way and
  in galaxy clusters
  In several recent papers it was claimed that SN 1987A data supports the
existence of 4.0 eV and 21.4 eV active neutrino mass eigenstates, and it was
shown that such large masses could be made consistent with existing constraints
including neutrino oscillation data and upper limits on the neutrino flavor
state masses, provided that there also exist a pair of sterile neutrino mass
states whose masses are nearly degenerate with the active ones, plus a third
active-sterile doublet that is tachyonic ($m^2 <0$). Here, independent evidence
is presented for the existence of sterile neutrinos with the previously claimed
masses based on fits to the dark matter distributions in the Milky Way galaxy
and four clusters of galaxies. The fits are in excellent agreement with
observations. In addition, sterile neutrinos having the suggested masses
address the "cusp" problem and the missing satellites problem, as well as that
of the "top down" scenario of structure formation -- previously a chief
drawback of HDM particles. Nevertheless, the highly controversial nature of the
claim, and the need for two free parameters in the dark matter fits, additional
confirming evidence will be required before it can be considered proven.
