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2010

Slow-roll inflation in (R+R*4) gravity

Kaneda, S., Ketov, S. V., Watanabe, N.

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We reconsider the toy-model of topological inflation, based on the R*4-modified gravity.

By using its equivalence to the certain scalar-tensor gravity model in four space-time dimensions, we compute the inflaton scalar potential and investigate a possibility of inflation.
We confirm the existence of the slow-roll inflation with an exit.
However, the model suffers from the eta-problem that gives rise to the unacceptable value of the spectral index n_s of scalar perturbations.

Slow-roll inflation in (R+R*4) gravity · Around

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