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

Geometrical destabilization, premature end of inflation and Bayesian model selection