Beyond Starobinsky inflation

Abstract

A supergravity extension of the $(R+R^2)$ gravity with the additional (Born-Infeld) structure of a massive vector multiplet gives rise to the specific $F(R)$ gravity, whose structure is investigated in detail. The massive vector multiplet has inflaton (scalaron), goldstino and a massive vector field as its field components. The model describes Starobinsky inflation and allows us to extrapolate the $F(R)$ function beyond the inflationary scale (up to Planck scale). We observe some differences versus the $(R+R^2)$ gravity, and several breaking patterns of the well known correspondence between the $F(R)$ gravity and the scalar-tensor gravity.

arXiv comment14 pages, LaTex, 2 figures

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• Higgs Inflation, Vacuum Stability, and Leptogenesis
• Polonyi-Starobinsky supergravity with inflaton in a massive vector multiplet with DBI and FI terms
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• Thermodynamics of the Primordial Universe
• Nonlinear evolution of anisotropic matter configurations under higher-order curvature corrections
• Born - Infeld-type modified gravity
• Stability investigations of de Sitter inflationary solutions in power-law extensions of the Starobinsky model
• Generalized black-bounces solutions in f(R) gravity and their field sources
• Non-trivial Extension of Starobinsky Inflation
• Phenomenology of SUGRA Extensions of the Starobisnky Model
• Bouncing cosmologies from Born-Infeld-type gravity