Globular Clusters and Dark Satellite Galaxies through the Stream
  Velocity
  The formation of purely baryonic globular clusters with no gravitationally
bound dark matter is still a theoretical challenge. We show that these objects
might form naturally whenever there is a relative stream velocity between
baryons and dark matter. The stream velocity causes a phase shift between
linear modes of baryonic and dark matter perturbations, which translates to a
spatial offset between the two components when they collapse. For a 2sigma
(3sigma) density fluctuation, baryonic clumps with masses in the range 1e5 -
2.5e6 Msun (1e5 - 4e6 Msun) collapse outside the virial radii of their
counterpart dark matter halos. These objects could survive as long-lived dark
matter-free objects and might conceivably become globular clusters. In
addition, their dark matter counterparts, which were deprived of gas, might
become dark satellite galaxies.
