Starobinsky-like two-field inflation

Sho Kaneda, Sergei V. Ketov

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We consider an extension of the Starobinsky model, whose parameters are functions of an extra scalar field. Our motivation is to test the robustness (or sensitivity) of the Starobinsky inflation against mixing scalaron with another (matter) scalar field. We find that the extended Starobinsky model is (classically) equivalent to the two-field inflation, with the scalar potential having a flat direction. For the sake of fully explicit calculations, we perform a numerical scan of the parameter space. Our findings support the viability of the Starobinsky-like two-field inflation for a certain range of its parameters, which is characterized by the scalar index ns=0.96±0.01, the tensor-to-scalar ratio r

Original languageEnglish
Article number26
Pages (from-to)1-14
Number of pages14
JournalEuropean Physical Journal C
Issue number1
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Engineering (miscellaneous)

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