DBI inflation with a non-minimally coupled Gauss-Bonnet term

Understand

We study the inflation in a model with a Gauss-Bonnet term which is non-minimally coupled to a DBI field.

• We study the spectrum of the primordial perturbations in detail.
• The non-Gaussianity of this model is considered and the amplitude of the non-Gaussianity is studied in both the equilateral and orthogonal configurations.
• By taking various functions of the DBI field, inflaton potential and the Gauss-Bonnet coupling term, we test the model with observational data and find some constraints on the Gauss-Bonnet coupling parameter.