Slow-roll inflation in the (R + R<sup>4</sup>) gravity

Abstract

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 n_s of scalar perturbations.

Original language	English
Article number	145016
Journal	Classical and Quantum Gravity
Volume	27
Issue number	14
DOIs	https://doi.org/10.1088/0264-9381/27/14/145016
Publication status	Published - 2010

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1088/0264-9381/27/14/145016

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title = "Slow-roll inflation in the (R + R4) gravity",

abstract = "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.",

author = "Sho Kaneda and Ketov, {Sergei V.} and Natsuki Watanabe",

year = "2010",

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language = "English",

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