We investigate two classes of models of quintessential inflation, based upon
canonical as well as noncanonical scalar fields. In particular, introducing
potentials steeper than the standard exponential, we construct models that can
give rise to a successful inflationary phase, with signatures consistent with
Planck 2015 results. Additionally, using nonminimal coupling of the scalar
field with massive neutrino matter, we obtain the standard thermal history of
the Universe, with late-time cosmic acceleration as the last stage of
evolution. In both cases, inflation and late-time acceleration are connected by
a tracker solution.Comment: 13 pages, 18 figures, minor clarifications added and refs updated, to
appear in PR
