Scalar-tensor linear inflation

Abstract

We investigate two approaches to non minimally coupled gravity theories which present linear inflation as attractor solution: a) the scalar-tensor theory approach, where we look for a scalar-tensor theory that would restore results of linear inflation in the strong coupling limit for any form of the non-minimal coupling to gravity of the form of $f(\phi )R/2$; b) the particle physics approach, where we motivate the form of the Jordan frame potential by the loop corrections to the inflaton field. In both cases the Jordan frame potentials are modifications of the induced inflation, but instead of the Starobinsky attractor they lead to the linear inflation in the strong coupling limit.

12 pages, 4 figures. Matches the published version on JCAP

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• A frame independent classification of single field inflationary models
• Dynamically induced Planck scale and inflation in the Palatini formulation
• New universal attractor in nonmininally coupled gravity: Linear inflation
• CMB constraints on the inflaton couplings and reheating temperature in $\alpha$-attractor inflation
• Constant-Roll (Quasi-)Linear Inflation
• Scale-Invariant Quadratic Gravity and Inflation in the Palatini Formalism
• Nonminimal Coleman--Weinberg Inflation with an $R^2$ term
• Non-minimally coupled quartic inflation with Coleman-Weinberg one-loop corrections in the Palatini formulation
• A minimal model of inflation and dark radiation
• Non-minimal (self-)running inflation: metric vs. Palatini formulation
• Multiple point criticality principle and Coleman-Weinberg inflation
• Non-minimally coupled Natural Inflation: Palatini and Metric formalism with the recent BICEP/Keck
• Inflationary attractors and radiative corrections in light of ACT data
• Discrepancy between cosmological and electroweak observables in Higgs Inflation
• Higgs inflation and cosmological electroweak phase transition with N scalars in the post-Higgs era
• Inflation from the Finite Scale Gauged Nambu-Jona-Lasinio Model
• Very low scale Coleman-Weinberg inflation with non-minimal coupling
• Natural Higgs Inflation, Gauge Coupling Unification, and Neutrino Masses
• Attractor Models in Scalar-Tensor Theories of Inflation
• Palatini Higgs and Coleman-Weinberg inflation with non-minimal coupling
• Post-inflationary Leptogenesis and Dark Matter production: Metric versus Palatini formalism
• Quadratic chaotic inflation with a logarithmic-corrected mass
• Hill-climbing dark inflation