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Gauss-Bonnet Inflation

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.

preprint2015arXivOpen access
Panagiota KantiRadouane GannoujiNaresh Dadhich
astro-ph.COhep-phgr-qchep-th
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Panagiota KantiRadouane GannoujiNaresh Dadhich

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