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2015

Gauss-Bonnet Inflation

Kanti, Panagiota, Gannouji, Radouane, Dadhich, Naresh

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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 and are replaced by linearly expanding -- Milne -- phases.

Gauss-Bonnet Inflation · Around

Built on

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H. Motohashi, A. A. Starobinsky and J. Yokoyama, arXiv:1411.5021 [astro-ph.CO]
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Then

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1998
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1999
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P. Kanti, B. Kleihaus and J. Kunz, Phys. Rev. Lett. 107
2012
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