Constraining sub-GeV dark matter from Migdal and Boosted effects
  Given the current strong constraints on WIMPs, search for sub-GeV Dark Matter
(DM) now is an essential task in direct detections. In order to overcome the
limitation of low recoils, enhancing ionization rate of electron from Migdal
effect and modifying the velocity distribution of DM from interaction of DM and
cosmic rays are two important ways. In this work, we find that these two ways
are complementary to probe sub-GeV DM. The former can cover heavier DM, while
the latter can cover the lighter DM. Both of them can cover DM with a mass of
20 MeV to 200 MeV. Including momentum transfer effect can greatly improve the
existing bounds.
