Measuring the duration of inflation with the curvaton

Abstract

Simple models of single-field inflation in the very early universe can generate the observed amplitude and scale dependence of the primordial density perturbation, but models with multiple fields can provide an equally good fit to current data. We show how future observations will be able to distinguish between currently favoured models. If a curvaton field generates the primordial perturbations after inflation, we show how the total duration of inflation can be measured.

7 pages, 3 figures -- matches published version

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• Primordial Non-Gaussianity $f_{\mathrm{NL}}$ and Anisotropies in Scalar-Induced Gravitational Waves
• Curbing PBHs with PTAs
• Constraints on primordial black holes from LIGO-Virgo-KAGRA O3 events
• Primordial Non-Gaussianity
• Stochastic inflation with an extremely large number of $e$-folds
• Computing First-Passage Times with the Functional Renormalisation Group
• Spectator dark matter in non-standard cosmologies
• Primordial black holes from a curvaton: the role of bimodal distributions
• Curvaton: Perturbations and reheating
• Comprehensive analysis of dissipative effects in the induced gravitational waves
• Kination cosmology from scalar fields and gravitational-wave signatures