Cornering Extended Starobinsky Inflation with CMB and SKA

Abstract

Starobinsky inflation is an attractive, fundamental model to explain the Planck measurements, and its higher-order extension may allow us to probe quantum gravity effects. We show that future CMB data combined with the 21cm intensity map from SKA will meaningfully probe such an extended Starobinsky model. A combined analysis will provide a precise measurement and intriguing insight into inflationary dynamics, even accounting for correlations with astrophysical parameters.

arXiv commentMatches with published version

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• Optimal, fast, and robust inference of reionization-era cosmology with the 21cmPIE-INN
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• Echoes of $R^3$ modification and Goldstone preheating in the CMB-BAO landscape