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No-Scale Supergravity Inflation

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Supersymmetry is the most natural framework for physics above the TeV scale, and the corresponding framework for early-Universe cosmology, including inflation, is supergravity. No-scale supergravity emerges from generic string compactifications and yields a non-negative potential, and is therefore a plausible framework for constructing models of inflation. No-scale inflation yields naturally predictions similar to those of the Starobinsky model based on R + R2 gravity, with a tilted spectrum of scalar perturbations: ns ∼ 0.96, and small values of the tensor-to- scalar perturbation ratio r < 0.1, as favoured by Planck and other data on the cosmic microwave background (CMB). Detailed measurements of the CMB may provide insights into the embedding of no-scale inflation within string theory as well as its links to collider physics.

This talk is part of the Wednesday HEP-GR Colloquium series.

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