Beyond the Starobinsky model after ACT
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. R3, R4,·s) can bring the model into better agreement with current data and impose nontrivial constraints on the post-inflationary dynamics.
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