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Review highlights constant-roll inflation's compatibility with observational constraints, suggesting its role in primordial black hole formation.
Constant-roll inflation is a distinctive class of phenomenological inflationary models in which the inflaton's rate of roll remains constant. It provides an exact solution that is compatible with the latest observational constraints and offers a natural framework for enhancing the curvature power spectrum, which is relevant to the formation of primordial black holes. In this paper, I review constant-roll inflation in memory of Alexei Starobinsky.
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Hayato Motohashi (2025) studied this question.
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