Local gravity test of unified models of inflation and dark energy in
  $f(R)$ gravity
  We consider $f(R)$ gravity theories which unify $R^n$ inflation and dark
energy models. First, from the final Planck data of the cosmic microwave
background, we obtain a condition, $1.977 < n < 2.003$. Next, under this
constraint, we investigate local-gravity tests for three models. We find that
the $R^n$ term can dominate over the dark energy term even at the Earth's
curvature scale, contrary to intuition; however, the $R^n$ term does not relax
or tighten the constraints on the three models.
