Primordial features and Planck polarization
  With the Planck 2015 Cosmic Microwave Background (CMB) temperature and
polarization data, we search for possible features in the primordial power
spectrum (PPS). We revisit the Wiggly Whipped Inflation (WWI) framework and
demonstrate how generation of some particular primordial features can improve
the fit to Planck data. WWI potential allows the scalar field to transit from a
steeper potential to a nearly flat potential through a discontinuity either in
potential or in its derivatives. WWI offers the inflaton potential
parametrizations that generate a wide variety of features in the primordial
power spectra incorporating most of the localized and non-local inflationary
features that are obtained upon reconstruction from temperature and
polarization angular power spectrum. At the same time, in a single framework it
allows us to have a background parameter estimation with a nearly free-form
primordial spectrum. Using Planck 2015 data, we constrain the primordial
features in the context of Wiggly Whipped Inflation and present the features
that are supported both by temperature and polarization. WWI model provides
more than $13$ improvement in $\chi^2$ fit to the data with respect to the best
fit power law model considering combined temperature and polarization data from
Planck and B-mode polarization data from BICEP and Planck dust map. We use 2-4
extra parameters in the WWI model compared to the featureless strict slow roll
inflaton potential. We find that the differences between the temperature and
polarization data in constraining background cosmological parameters such as
baryon density, cold dark matter density are reduced to a good extent if we use
primordial power spectra from WWI. We also discuss the extent of bispectra
obtained from the best potentials in arbitrary triangular configurations using
the BI-spectra and Non-Gaussianity Operator (BINGO).
