Spotting deviations from R2 inflation

Alvaro De La Cruz-Dombriz, Emilio Elizalde, Sergei D. Odintsov, Diego Sáez-Gómez

    Research output: Contribution to journalReview articleResearchpeer-review

    29 Citations (Scopus)


    © 2016 IOP Publishing Ltd and Sissa Medialab srl. We discuss the soundness of inflationary scenarios in theories beyond the Starobinsky model, namely a class of theories described by arbitrary functions of the Ricci scalar and the K-essence field. We discuss the pathologies associated with higher-order equations of motion which will be shown to constrain the stability of this class of theories. We provide a general framework to calculate the slow-roll parameters and the corresponding mappings to the theory parameters. For paradigmatic gravitational models within the class of theories under consideration we illustrate the power of the Planck/Bicep2 latest results to constrain such gravitational Lagrangians. Finally, bounds for potential deviations from Starobinsky-like inflation are derived.
    Original languageEnglish
    Article number060
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number5
    Publication statusPublished - 25 May 2016


    • cosmological perturbation theory
    • gravity
    • inflation
    • modified gravity


    Dive into the research topics of 'Spotting deviations from R2 inflation'. Together they form a unique fingerprint.

    Cite this