# Reconciling tensor and scalar observables in G-inflation

@article{Ramirez2018ReconcilingTA, title={Reconciling tensor and scalar observables in G-inflation}, author={H'ector Ram'irez and Samuel Passaglia and Hayato Motohashi and Wayne Hu and Olga Mena}, journal={arXiv: Cosmology and Nongalactic Astrophysics}, year={2018} }

The simple $m^2\phi^2$ potential as an inflationary model is coming under increasing tension with limits on the tensor-to-scalar ratio $r$ and measurements of the scalar spectral index $n_s$. Cubic Galileon interactions in the context of the Horndeski action can potentially reconcile the observables. However, we show that this cannot be achieved with only a constant Galileon mass scale because the interactions turn off too slowly, leading also to gradient instabilities after inflation ends…

## 8 Citations

Warm
G
inflation: Intermediate model

- PhysicsPhysical Review D
- 2019

A warm-intermediate inflationary universe model is studied in the presence of the Galileon coupling $G(\phi,X)=g(\phi)X$. General conditions required for successful inflation are deduced and…

Inflation with derivative self-interaction and coupling to gravity

- PhysicsThe European Physical Journal C
- 2019

We consider a subclass of Horndeski theories for studying cosmic inflation. In particular, we investigate models of inflation in which the derivative self-interaction of the scalar field and the…

Chaotic inflation and reheating in generalized scalar-tensor gravity

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2021

In the present work, we study slow-roll inflation in scalar-tensor gravity theories in the presence of both the non-minimal coupling between the scalar field and curvature, and the Galileon…

Noncanonical Approaches To Inflation

- Physics
- 2019

In this Thesis by publication, we cover both phenomenological and theoretical approaches to the study of inflation: from model-independent parametrizations to modifications of gravity. In a review…

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- PhysicsPhysical Review D
- 2019

We consider single field chaotic inflationary models plus a cosine modulation term, as in axion monodromy models, and augment it by a light scalar field with similar cosine coupling. We show the…

Scalar bispectrum beyond slow-roll in the unified EFT of inflation

- PhysicsPhysical Review D
- 2018

We present a complete formulation of the scalar bispectrum in the unified effective field theory (EFT) of inflation, which includes the Horndeski and beyond-Horndeski GLPV classes, in terms of a set…

Effective field theory of degenerate higher-order inflation

- Physics
- 2020

We extend the effective field theory of inflation to a general Lagrangian constructed from Arnowitt-Deser-Misner variables that encompasses the most general interactions with up to second derivatives…

The Black Hole Window on Cosmic Inflation

- Physics
- 2020

We develop in this thesis the principles governing the production of our universe's primordial inhomogeneities during its early phase of inflation. As a guiding thread we ask what physics during…

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