  The recent detection by the BICEP2 collaboration of a high level of tensor
modes has relevant implications which we briefly discuss in this short note. In
particular, the large angle CMB B- mode polarisation seems to imply problematic
super-Planckian excursions of the inflaton field. We provide some comments
about this point and in particular we stress a natural resolution to it: given
our current (and probably future) observational ignorance about the true source
of the scalar perturbations, one should abandon the theoretical prejudice that
they are associated to the inflaton fluctuations.
