The End of Cosmic Growth
  The growth of large scale structure is a battle between gravitational
attraction and cosmic acceleration. We investigate the future behavior of
cosmic growth under both general relativity (GR) and modified gravity during
prolonged acceleration, deriving analytic asymptotic behaviors and showing that
gravity generally loses and growth ends. We also note the `why now' problem is
equally striking when viewed in terms of the shut down of growth. For many
models inside GR the gravitational growth index $\gamma$ also shows today as a
unique time between constant behavior in the past and a higher asymptotic value
in the future. Interestingly, while $f(R)$ models depart in this respect
dramatically from GR today and in the recent past, their growth indices are
identical in the asymptotic future and past.
