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A No-Scale Inflationary Model to Fit Them All
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abstract
The magnitude of B-mode polarization in the cosmic microwave background as measured by BICEP2 favours models of chaotic inflation with a quadratic $m^2 \phi^2/2$ potential, whereas data from the Planck satellite favour a small value of the tensor-to-scalar perturbation ratio $r$ that is highly consistent with the Starobinsky $R + R^2$ model. Reality may lie somewhere between these two scenarios. In this paper we propose a minimal two-field no-scale supergravity model that interpolates between quadratic and Starobinsky-like inflation as limiting cases, while retaining the successful prediction $n_s \simeq 0.96$.
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How Accidental was Inflation?
A small, string-theoretically plausible deformation of the Starobinsky potential (lambda about 0.9999) fits the Planck plus ACT and DESI value of the spectral tilt better than the pure Starobinsky model, and introduce...
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