2017/12/03 by Lorenzo Sebastiani, Sebastiani, Lorenzo, Shynaray Myrzakul +3
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.1712.00738
openalex publication_date 2017/12/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we analyze the early-time inflation in a scalar-tensor theory\nof gravity where the scalar field is minimally coupled with the Gauss-Bonnet\nfour dimensional topological invariant. The theory belongs to a class of\nHorndeski models where the field equations are at the second order like in\nGeneral Relativity. A viable inflationary scenario must correctly reproduce the\nlast Plank satellite data. By starting from some simple assumptions on the\nfield and on the coupling function between the field and the Gauss-Bonnet term,\nwe derive the spectral index and the tensor-to-scalar ratio of the model. Once\nthe model is viable, it is finally possible to fully reconstruct its\nLagrangian.\n