A physical interpretation of Hubble's law and the cosmological redshift
  from the perspective of a static observer
  We derive explicit and exact expressions for the physical velocity of a free
particle comoving with the Hubble flow as measured by a static observer, and
for the frequency shift of light emitted by a comoving source and received,
again, by a static observer. The expressions make it clear that an
interpretation of the redshift as a kind of Doppler effect only makes sense
when the distance between the observer and the source vanishes exactly.
