Remarks on the Starobinsky model of inflation and its descendants

Alexandros Kehagias, Azadeh Moradinezhad Dizgah, and Antonio Riotto
Phys. Rev. D 89, 043527 – Published 28 February 2014

Abstract

We point out that the ability of some models of inflation, such as the Higgs inflation and the universal attractor models at large values of the coupling ξ, in reproducing the available data is due to their relation to the Starobinsky model of inflation. For large field values, where the inflationary phase takes place, all of these classes of models are indeed identical to the Starobinsky model. Nevertheless, the inflation is just an auxiliary field in the Jordan frame of the Starobinsky model, and this leads to two important consequences: first, the inflationary predictions of the Starobinsky model and its descendants are slightly different (albeit not measurably); second, the theories have different small-field behavior, leading to different ultraviolet cutoff scales. In particular, one interesting descendant of the Starobinsky model is the nonminimally coupled quadratic chaotic inflation. Although the standard quadratic chaotic inflation is ruled out by the recent Planck data, its nonminimally coupled version is in agreement with observational data and valid up to Planckian scales.

  • Received 30 December 2013

DOI:https://doi.org/10.1103/PhysRevD.89.043527

© 2014 American Physical Society

Authors & Affiliations

Alexandros Kehagias1,2, Azadeh Moradinezhad Dizgah1, and Antonio Riotto1

  • 1Department of Theoretical Physics and Center for Astroparticle Physics (CAP), 24 quai E. Ansermet, CH-1211 Geneva 4, Switzerland
  • 2Physics Division, National Technical University of Athens, 15780 Zografou Campus, Athens, Greece

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Issue

Vol. 89, Iss. 4 — 15 February 2014

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