Planck and WMAP constraints on generalised Hubble flow inflationary
  trajectories
  We use the Hamilton--Jacobi formalism to constrain the space of possible
single field, inflationary Hubble flow trajectories when compared to the WMAP
and Planck satellites Cosmic Microwave Background (CMB) results. This method
yields posteriors on the space of Hubble Slow Roll (HSR) parameters that
uniquely determine the history of the Hubble parameter during the inflating
epoch. The trajectories are used to numerically determine the observable
primordial power spectrum and bispectra that can then be compared to
observations. Our analysis is used to infer the most likely shape of the
inflaton potential $V(\phi)$ and also yields a prediction for, $f_{\rm NL}$,
the dimensionless amplitude of the non-Gaussian bispectrum.
