Regularization of single field inflation models

There are many single field inflationary models that are consistent with the recent Planck 2018 measurements of the spectral index ns and tensor-to-scalar ratio r. Despite good agreement with observational data some of these models suffer from having unregularized potentials which would produce a collapsing universe shortly after the end of inflation. In this paper we show that how one chooses to correct the behavior potential toward the end of inflation can have a significant effect on the inflationary predictions of the model, specifically in the case of quartic hilltop and radiatively corrected Higgs inflation.

Automated summary

English Summary: In this paper, the authors investigate the problem of unregularized potentials in modified inflation models, which would lead to a collapsing universe. They find that the choice of correcting the potential's behavior at the end of inflation has a significant impact on the inflationary predictions, particularly in the quartic hilltop and radiatively corrected Higgs inflation models.