Study in the noncanonical domain of Goldstone inflation
  Recent observations of the cosmic microwave background (CMB) indicate that a
successful theory of cosmological inflation needs to have flat potential of the
inflaton scalar field. Realizing the inflaton to be a pseudo-Nambu Goldstone
boson (pNGB) could ensure the flatness and the sub-Planckian scales related to
the dynamics of the paradigm. In this work, we have taken the most general form
of such a scenario: Goldstone inflation, and studied the model in the
noncanonical domain. Natural inflation is a limiting case of this model, which
is also studied here in the noncanonical regime. Our result is compared with
the recent release by Planck collaboration and it is shown that for some
combination of the model parameters, a Goldstone inflationary model in the
noncanonical realisation obeys the current observational bounds. Then, we
studied the era of reheating after the end of inflation. For different choice
of model parameters, constraints on the reheating temperature ($T_{\rm re}$)
and number of e-folds during reheating($N_{\rm re}$) for the allowed
inflationary observables (e.g. scalar spectral index($n_s$) and tensor to
scalar ratio($r$)) are predicted for this model.
