https://doi.org/10.1140/epjc/s10052-019-7368-1
Regular Article - Theoretical Physics
Generalized Galileon scenario inspires chaotic inflation
1
Instituto de Física, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950, Casilla 4059, Valparaíso, Chile
2
Sede Esmeralda, Universidad de Tarapacá, Avda. Luis Emilio Recabarren 2477, Iquique, Chile
3
Departamento de Física, Centro de Astrofísica e Gravitação, Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
* e-mail: nelson.videla@pucv.cl
Received:
10
August
2019
Accepted:
1
October
2019
Published online:
11
October
2019
We study chaotic inflation with a Galileon-like self-interaction 
, where 
. 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 
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.
© The Author(s), 2019
