Redshift drift in a pressure-gradient cosmology
  We derive a redshift drift formula for the spherically symmetric
inhomogeneous pressure Stephani universes which are complementary to the
spherically symmetric inhomogeneous density Lema\^itre-Tolman-Bondi models. We
show that there is a clear difference between redshift drift predictions for
these two models as well as between the Stephani models and the standard
$\Lambda$CDM Friedmann models. The Stephani models have positive drift values
at small redshift and behave qualitatively (but not quantitatively) as the
$\Lambda$CDM models at large redshift, while the drift for LTB models is always
negative. This prediction may perhaps be tested in future telescopes such as
European Extremely Large Telescope (EELT), Thirty Meter Telescope (TMT), Giant
Magellan Telescope (GMT), and especially, in gravitational wave interferometers
DECi-Hertz Interferometer Gravitational Wave Observatory and Big Bang Observer
(DECIGO/BBO), which aim at low redshift.
