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Beyond the Starobinsky model for inflation
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abstract
We single out the Starobinsky model and its extensions among generic $f(R)$ gravity as attractors at large field values for chaotic inflation. Treating a $R^3$ curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful inflationary predictions. We find that the scalar spectral index can vary in both the red or blue tilted direction, depending on the sign of the coefficient of the $R^3$ term, whereas the tensor-to-scalar ratio is less affected in the Planck-compatible region. We also discuss the role of higher order curvature term for stability and the reheating dynamics for the unambiguous prediction for the number of efoldings up to the $R^3$ term.
Forward citations
Cited by 5 Pith papers
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Unstable de Sitter inflationary solution in sixth-order gravity
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ACT stands for Awkward Cosmology Theories
Reconciling Starobinsky inflation with ACT data requires fine-tuned higher-curvature scales, stiff reheating with ω_reh>1/3, or negative-energy towers, all hard to motivate from UV completions.
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Under the Remmen-Carroll measure, the expected total e-folds for Starobinsky inflation are only about 3.5 to 4 for observationally allowed field values.
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Starobinsky Inflation and the Latest CMB Data: A Subtle Tension?
When implemented directly in CLASS, Starobinsky inflation remains consistent with Planck+ACT+BAO data at the 2σ level, but the inferred e-fold range sits above the reheating-motivated window, and a fitted R³ correctio...
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