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Abstract: We reconsider the toy-model of topological inflation, based on theR*4-modified gravity. By using its equivalence to the certain scalar-tensorgravity model in four space-time dimensions, we compute the inflaton scalarpotential and investigate a possibility of inflation. We confirm the existenceof the slow-roll inflation with an exit. However, the model suffers from theeta-problem that gives rise to the unacceptable value of the spectral index n sof scalar perturbations.



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

Fuente: https://arxiv.org/







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