Exponential potential for an inflaton with nonminimal kinetic coupling and its supergravity embedding

Abstract

In the light of the new observational results we discuss the status of the exponential potentials driving inflation. We depart form the minimal scenario and study an inflaton kinetically coupled to the Einstein tensor. We find that in this case the exponential potentials are well compatible with observations. Their predictions coincide with those of the chaotic type quadratic potential for an inflaton minimally coupled to gravity. We show that there exists a simple mapping between the two models. Moreover, a novel aspect of our model is that it features a natural exit from the inflationary phase even in the absence of a minimum. We also turn to supergravity and motivate these sort of potentials and the non-minimal kinetic coupling as possible effective dilaton theories.

11 pages, 1 figure, journal version

References in corpus (17)

• Quintessence and phantom cosmology with non-minimal derivative coupling
• The Powers of Monodromy
• The Imaginary Starobinsky Model
• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• Chaotic Inflation in Supergravity after Planck and BICEP2
• On Climbing Scalars in String Theory
• Resurrecting Quadratic Inflation in No-Scale Supergravity in Light of BICEP2
• A No-Scale Inflationary Model to Fit Them All
• Natural Inflation in Supergravity and Beyond
• Remarks about the Tensor Mode Detection by the BICEP2 Collaboration and the Super-Planckian Excursions of the Inflaton Field
• Is Imaginary Starobinsky Model Real?
• Power Spectrum and Signatures for Cascade Inflation
• Pre - Inflationary Clues from String Theory ?
• Higher Derivative D-term Inflation in New-minimal Supergravity
• DBI Inflation in N=1 Supergravity
• Inflation, quantum fluctuations and cosmological perturbations
• Naturalness and Chaotic Inflation in Supergravity from Massive Vector Multiplets

Cited by in corpus (6)

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• Higher Derivative D-term Inflation in New-minimal Supergravity
• Constraints on tachyon inflationary models with an AdS/CFT correspondence
• More on DBI action in 4D $\mathcal{N}=1$ supergravity
• Non-minimal derivative couplings and inflation in supergravity