  Even though the "free" neutrons in the inner crust of a neutron star are
superfluid, they are still strongly coupled to nuclei due to non-dissipative
entrainment effects. These effects have been systematically studied in all
regions of the inner crust in the framework of the band theory of solids. Using
concepts from solid-state physics, it is shown that the density of conduction
neutrons, i.e. neutrons that are effectively "free", can be much smaller than
the density of unbound neutrons (by an order of magnitude in some layers) due
to Bragg scattering. These results suggest that a revision of the
interpretation of various observable neutron-star phenomena may be necessary.
