Eur. Phys. J. Plus (2017) 132: 514
https://doi.org/10.1140/epjp/i2017-11789-8

Regular Article

Reconstruction of inflation from scalar field non-minimally coupled with the Gauss-Bonnet term

¹ Department of General & Theoretical Physics and Eurasian Center for Theoretical Physics, Eurasian National University, 010008, Astana, Kazakhstan
² Dipartimento di Fisica, Università di Trento, Trento, Italy
³ Department of Theoretical and Nuclear Physics, Al-Farabi Kazakh National University, Al-Farabi Almaty, Kazakhstan

^* e-mail: lorenzo.sebastiani@unitn.it

Received: 30 October 2017
Accepted: 12 November 2017
Published online: 8 December 2017

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.