Abstract:
In this paper, we analyze the early time inflation in a scalar-tensor theory of gravity where
the scalar field is minimally coupled with the Gauss-Bonnet four-dimensional topological invariant. The
theory belongs to a class of Horndeski models where the field equations are at the second order, like in
General Relativity. A viable inflationary scenario must correctly reproduce the last Plank satellite data.
By starting from some simple assumptions on the field and on the coupling function between the field and
the Gauss-Bonnet term, we derive the spectral index and the tensor-to-scalar ratio of the model. Once the
model is viable, it is finally possible to fully reconstruct its Lagrangian.
