Features in single field slow-roll inflation
  We compare the effects of local features (LF) and branch features (BF) of the
inflaton potential on the spectrum of primordial perturbations. We show that LF
affect the spectrum in a narrow range of scales while BF produce a step between
large and small scales with respect to the featureless spectrum. We comment on
the possibility of distinguishing between these two types of feature models
from the analysis of the Cosmic Microwave Background (CMB) radiation data.
  We also show that there exists a quantitative similarity between the
primordial spectra predicted by two of the BF potentials considered. This could
lead to a degeneracy of their predicted CMB temperature spectra which could
make difficult to discriminate between the models from a CMB analysis. We
comment on the possibility that the degeneracy can be broken when higher order
terms in the perturbations are considered. In this sense non-Gaussianity may
play an important role in discerning between different inflationary models
which predict similar spectra.
