Unification of Constant-roll Inflation and Dark Energy with Logarithmic
  $R^2$-corrected and Exponential $F(R)$ Gravity
  In this paper we investigate how to describe in a unified way a constant-roll
inflationary era with a dark energy era, by using the theoretical framework of
$F(R)$ gravity. To this end, we introduce some classes of appropriately chosen
$F(R)$ gravity models, and we examine in detail how the unification of early
and late-time acceleration eras can be achieved. We study in detail the
inflationary era, and as we demonstrate it is possible to achieve a viable
inflationary era, for which the spectral index of primordial curvature
perturbations and the scalar-to-tensor ratio can be compatible with the latest
observational data. In addition, the graceful exit issue is briefly discussed
for a class of models. Finally, we discuss the dark energy oscillations issue,
and we investigate which model from one of the classes we introduced, can
produce oscillations with the smallest amplitude.
