Gauss-Bonnet inflation

@article{Kanti2015GaussBonnetI,
  title={Gauss-Bonnet inflation},
  author={Panagiota Kanti and Radouane Gannouji and Naresh Dadhich},
  journal={Physical Review D},
  year={2015},
  volume={92},
  pages={041302}
}
We consider an Einstein-Scalar-Gauss-Bonnet gravitational theory, and argue that at early times the Ricci scalar can be safely ignored. We then demonstrate that the pure scalar-Gauss-Bonnet theory, with a quadratic coupling function, naturally supports inflationary -- de Sitter -- solutions. During inflation, the scalar field decays exponentially and its effective potential remains always bounded. The theory contains also solutions where these de Sitter phases possess a natural exit mechanism… 

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