Sterile Neutrino Dark Matter Production in the Neutrino-phillic Two
  Higgs Doublet Model
  Sterile Neutrinos with a mass in the keV range form a good candidate for dark
matter. They are naturally produced from neutrino oscillations via their mixing
with the active neutrinos. However the production via non-resonant neutrino
oscillations has recently been ruled out. The alternative production via Higgs
decay is negligibly small compared to neutrino oscillations. We show that in
the neutrino-phillic two Higgs doublet model, the contribution from Higgs decay
can dominate over the contribution from neutrino oscillations and evade all
constraints. We also study the free-streaming horizon and find that a sterile
neutrino mass in the range of 4 to 53 keV leads to warm dark matter.
