A general method for the construction of stable Galileon models consistent with the Planck data results

TL;DR

This paper introduces a reconstruction method for building stable inflation models within G-inflation that are fully consistent with Planck satellite observational data, ensuring stability and observational viability.

Contribution

It develops a general reconstruction procedure for G-inflation models that guarantees stability and observational consistency, adaptable to various Lagrangians and data constraints.

Findings

Constructed explicit stable inflation models matching Planck data

Demonstrated the method's flexibility for different Lagrangians

Ensured models satisfy spectral index, tensor-to-scalar ratio, and running constraints

Abstract

The reconstruction procedure, which has proven quite useful to obtain viable models of the universe evolution, is here employed in order to construct inflation models. It has the advantages that it ensures full consistency with astronomical observations and that it allows to evaluate the stability of the resulting cosmological model quite easily. The reconstruction for two different types of Lagrangian, included in the frame of G-inflation, is carried out in detail and explicit models for each Lagrangian are constructed. As a bonus for having used this reconstruction formalism, the final models are easily adjusted to satisfy the observational constraints---imposed by the most recent data releases of the Planck mission---on the spectral index, the tensor to scalar ratio, and the running of the spectral index. Further, it turns also to be not difficult to make the models stable. Thus, the method here developed provides a general and very efficient tool, a quite natural procedure to construct models consistent with very precise observations. It can also be applied to other models, besides the ones here considered.