Slow-roll inflation in the (R + R4) gravity

Sho Kaneda, Sergei V. Ketov, Natsuki Watanabe

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We reconsider a toy model of topological inflation, based on the R 4-modified gravity. By using its equivalence to a certain scalar-tensor gravity model in four spacetime dimensions, we compute the inflaton scalar potential and investigate the possibility of inflation. We confirm the existence of slow-roll inflation with an exit. However, the model suffers from the η-problem that gives rise to the unacceptable value of the spectral index ns of scalar perturbations.

Original languageEnglish
Article number145016
JournalClassical and Quantum Gravity
Issue number14
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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