Gauss-Bonnet inflation

Panagiota Kanti, RADOUANE GANNOUJI , Naresh Dadhich

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

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 also contains solutions where these de Sitter phases possess a natural exit mechanism and are replaced by linearly expanding - Milne - phases.

Original languageEnglish
Article number041302
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number4
DOIs
StatePublished - 24 Aug 2015

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