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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Min Gi Park
Dhong Yeon Cheong
Seong Chan Park
Physics Letters B
University of Chicago
Yonsei University
Korea Institute for Advanced Study
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Park et al. (Wed,) studied this question.
www.synapsesocial.com/papers/69a75cd1c6e9836116a26007 — DOI: https://doi.org/10.1016/j.physletb.2026.140217