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• W4387366291 abstract "Abstract Cosmological α -attractors are a compelling class of inflationary models. They lead to universal predictions for large-scale observables, broadly independent from the functional form of the inflaton potential. In this work we derive improved analytical predictions for the large-scale observables, whose dependence on the duration of reheating and the parameter α is made explicit. We compare these with Planck and BICEP/Keck 2018 data in the framework of a Bayesian study, employing uniform logarithmic and linear priors for α . Our improved universal predictions allow direct constraints on the duration of reheating. Furthermore, while it is well-known that CMB constraints on the tensor-to-scalar ratio can be used to place an upper bound on the α parameter, we demonstrate that including the α -dependence of the scalar spectral tilt yields novel constraints on α . In particular, for small α , the scalar spectral tilt scales with log 10 α , regardless of the specific potential shape. For decreasing α , this eventually puts the models in tension with CMB measurements, bounding the magnitude of α from below. Therefore, in addition to the upper bound from the tensor-to-scalar ratio, we derive the first lower bound on the magnitude of α for α -attractor T-models, log 10 α = -4.2 +5.4 -8.6 at 95% C.L." @default.
• W4387366291 created "2023-10-06" @default.
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• W4387366291 date "2023-10-01" @default.
• W4387366291 modified "2023-10-16" @default.
• W4387366291 title "Novel CMB constraints on the α parameter in alpha-attractor models" @default.
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• W4387366291 doi "https://doi.org/10.1088/1475-7516/2023/10/015" @default.
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