# Generalized Galileon Scenario Inspires Chaotic Inflation

## TL;DR

This paper explores how a Galileon-like self-interaction influences chaotic inflation, showing it can suppress tensor-to-scalar ratios and fit observational data, with implications for reheating dynamics.

## Contribution

It introduces a generalized Galileon term into chaotic inflation models, analyzing its effects on inflation conditions, perturbations, and observational signatures.

## Key findings

- Galileon dominance suppresses tensor-to-scalar ratio
- Parameter space compatible with Planck data identified
- Reheating dynamics potentially affected by Galileon dominance

## Abstract

We study chaotic inflation with a Galileon-like self interaction $G(\phi,X)\Box \phi$, where $G(\phi,X)\propto X^{n}$. 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 $n_{\mathcal{S}}-r$ 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.