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March 3, 2026Physics Letters B2 citationsOpen Access

Beyond the Starobinsky model after ACT

MPMin Gi ParkYonsei UniversityDCDhong Yeon CheongYonsei UniversitySPSeong Chan ParkKorea Institute for Advanced Study

Key Points

  • The model shows improved agreement with data after incorporating higher order corrections to the Ricci scalar.
  • Significant tension exists between the original Starobinsky model predictions and recent P-ACT-LB-BK18 data.
  • This analysis revisits the parameters influencing the inflationary model's dynamics, broadly impacting cosmological theories.
  • Understanding these adjustments may lead to important implications for post-inflationary dynamics in cosmology.

Abstract

We revisit higher order corrections to the Starobinsky inflationary model using the most recent P-ACT-LB-BK18 data, which exhibits a mild but definite tension with the predictions of the original model. Our results demonstrate how even small higher order deformations of the Ricci scalar (e.g. R 3 , R 4 , ⋅⋅⋅) can bring the model into better agreement with current data and impose nontrivial constraints on the post-inflationary dynamics.

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Cite This Study

Park et al. (2026) studied this question.

synapsesocial.com/papers/69a75cd1c6e9836116a26007https://doi.org/10.1016/j.physletb.2026.140217
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