ABSTRACT
The general wisdom of the galaxy structure of a spiral galaxy like the Milky Way is that it has baryonic component in the central bulge and spiral arms which are embedded in a spherical halo of dark matter. The spherical halo is in dynamical equilibrium. Due to the motion of the solar system (around the galactic center) and also due to the motion of the Earth itself, the Earth encounters an apparent dark matter wind from the direction opposite to the direction of motion of the solar system. The dark matter direct detection experiments attempt to detect the dark matter that the detector may possibly encounter.
