Inflation in no-scale supergravity

Abstract

$R+R^2$ Supergravity is known to be equivalent to standard Supergravity coupled to two chiral supermultiples with a no-scale Kähler potential. Within this framework, that can accomodate vanishing vacuum energy and spontaneous supersymmetry breaking, we consider modifications of the associated superpotential and study the resulting models, which, viewed as generalizations of the Starobinsky model, for a range of the superpotential parameters, describe viable single-field slow-roll inflation. In all models studied in this work the tensor to scalar ratio is found to be small, well below the upper bound established by the very recent PLANCK and BICEP2 data.

15 pages, 6 figures, references and comments added

References in corpus (7)

• A Joint Analysis of BICEP2/Keck Array and Planck Data
• The Minimal Volkov - Akulov - Starobinsky Supergravity
• On sgoldstino-less supergravity models of inflation
• Inflation and Uplifting with Nilpotent Superfields
• Resurrecting Quadratic Inflation in No-Scale Supergravity in Light of BICEP2
• A No-Scale Inflationary Model to Fit Them All
• Generic Scalar Potentials for Inflation in Supergravity with a Single Chiral Superfield

Cited by in corpus (6)

• Planck, LHC, and $\alpha$-attractors
• Single-field $\alpha$-attractors
• Inflation and High-Scale Supersymmetry with an EeV Gravitino
• Starobinsky-Like Inflation and Neutrino Masses in a No-Scale SO(10) Model
• ${\mathcal{R}}^2$ Supergravity
• Black Hole Solutions in $R^2$ Gravity