Geometrical destabilization, premature end of inflation and Bayesian
  model selection
  By means of Bayesian techniques, we study how a premature ending of
inflation, motivated by geometrical destabilization, affects the observational
evidences of typical inflationary models. Large field models are worsened, and
inflection point potentials are drastically improved for a specific range of
the field-space curvature characterizing the geometrical destabilization. For
other models we observe shifts in the preferred values of the model parameters.
For quartic hilltop models for instance, contrary to the standard case, we find
preference for theoretically natural sub-Planckian hill widths. Eventually, the
Bayesian ranking of models becomes substantially reordered with a premature end
of inflation. Such a phenomenon also modifies the constraints on the reheating
expansion history, which has to be properly accounted for since it determines
the position of the observational window with respect to the end of inflation.
Our results demonstrate how the interpretation of cosmological data in terms of
fundamental physics is considerably modified in the presence of premature end
of inflation mechanisms.
