The running of featureful primordial power spectra
  Current measurements of the temperature and polarization anisotropy power
spectra of the Cosmic Microwave Background (CMB) seem to indicate that the
naive expectation for the slow-roll hierarchy within the most simple
inflationary paradigm may not be respected in nature. We show that a primordial
power spectra with localized features could in principle give rise to the
observed slow-roll anarchy when fitted to a featureless power spectrum. Future
CMB missions have the key to disentangle among the two possible paradigms and
firmly establish the slow-roll mechanism as the responsible one for the
inflationary period in the early universe. From a model comparison perspective,
and assuming that nature has chosen a featureless primordial power spectrum, we
find that, while with mock Planck data there is only weak evidence against a
model with localized features, upcoming CMB measurements may provide strong
evidence against such a non-standard primordial power spectrum.
