Graceful exit from inflation to radiation era with rapidly decreasing
  agegraphic potentials
  We present a class of models where both the primordial inflation and the late
times de Sitter phase are driven by simple phenomenological agegraphic
potentials. In this context, a possible new scenario for a smooth exit from
inflation to the radiation era is discussed by resorting the kination (stiff)
era but without the inefficient radiation production mechanism of these models.
This is done by considering rapidly decreasing expressions for $V(t)$ soon
after inflation. We show that the parameters of our models can reproduce the
scalar spectral parameter $n_s$ predicted by Planck data in particular for
models with concave potentials. Finally, according to the recent BICEP2 data,
all our models allow a huge amount of primordial gravitational waves.
