A General Classification of Starobinsky-like Inflationary Avatars of SU(2,1)/SU(2) x U(1) No-Scale Supergravity

Abstract

Measurements of the cosmic microwave background (CMB) favour models of inflation with a small tensor-to-scalar ratio r, as predicted by the Starobinsky R + R^2 model. It has been shown previously that various models based on no-scale supergravity with different forms of superpotential make predictions similar to those of the Starobinsky model. In this paper we present a unified and general treatment of Starobinsky avatars of no-scale supergravity, using the underlying non-compact SU(2,1)/SU(2) x U(1) symmetry to demonstrate equivalences between different models, exhibiting 6 specific equivalence classes.

arXiv comment21 pages, 6 figures; details on stabilization added, version published in JHEP

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• Slow and Safe Gravitinos
• Symmetry Breaking and Reheating after Inflation in No-Scale Flipped SU(5)
• Inflation and Leptogenesis in High-Scale Supersymmetry
• Phenomenology and Cosmology of No-Scale Attractor Models of Inflation
• Exploring Critical Overdensity Thresholds in Inflationary Models of Primordial Black Holes Formation
• Generalized dilaton-axion models of inflation, de Sitter vacua and spontaneous SUSY breaking in supergravity
• Smooth coarse-graining and colored noise dynamics in stochastic inflation
• Pole-Induced Higgs Inflation With Hyperbolic Kaehler Geometries
• A Unified No-Scale Model of Modulus Fixing, Inflation, Supersymmetry Breaking and Dark Energy
• Particle physics and cosmology of the string derived no-scale flipped $SU(5)$
• Non-Oscillatory No-Scale Inflation
• From Minkowski to de Sitter in Multifield No-Scale Models
• Gravitational Waves From No-Scale Supergravity
• An Alternative Framework for E-Model Inflation in Supergravity
• $\alpha$-attractors from supersymmetry breaking
• Starobinsky Inflation with T-Model Kaehler Geometries
• Primordial Black Holes And Gravitational Waves Based On No-Scale Supergravity