Generalized Galileon scenario inspires chaotic inflation

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2019-10, Vol.79 (10), p.1-9, Article 839
• Main Authors: López, Matías, Maggiolo, Jorge, Videla, Nelson, González, Pablo, Panotopoulos, Grigoris
• Format: Article
• Language: English
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Elementary Particles; Hadrons; Heating; Heavy Ions; Inflation (Finance); Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; Relativity; String Theory; Tensors
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-7368-1

We study chaotic inflation with a Galileon-like self-interaction G ( ϕ , X ) □ ϕ , where G ( ϕ , X ) ∝ X n . General conditions required for successful inflation are deduced and discussed from the background and cosmological perturbations under slow-roll approximation. Interestingly, it is found that in the regime where the Galileon term dominates over the standard kinetic term, the tensor-to-scalar ratio becomes significantly suppressed in comparison to the standard expression in General Relativity (GR). Particularly, we find the allowed range in the space of parameters characterizing the chaotic quadratic and quartic inflation models by considering the current observational data of Planck from the n S - r plane. Finally, we discuss about the issue if the Galileon term is dominant by the end of inflation, this can affect the field oscillation during reheating.