Reheating predictions in Gravity Theories with Derivative Coupling

Abstract

We investigate the inflationary predictions of a simple Horndeski theory where the inflaton scalar field has a non-minimal derivative coupling (NMDC) to the Einstein tensor. The NMDC is very motivated for the construction of successful models for inflation, nevertheless its inflationary predictions are not observationally distinct. We show that it is possible to probe the effects of the NMDC on the CMB observables by taking into account both the dynamics of the inflationary slow-roll phase and the subsequent reheating. We perform a comparative study between representative inflationary models with canonical fields minimally coupled to gravity and models with NMDC. We find that the inflation models with dominant NMDC generically predict a higher reheating temperature and a different range for the tilt of the scalar perturbation spectrum $n_s$ and scalar-to-tensor ratio $r$, potentially testable by current and future CMB experiments.

JCAP version; minor corrections, results unchanged, figures and refs added compared to v1; 28 pages, 30 plots, plain text

References in corpus (15)

• Covariant Galileon
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Reheating constraints to inflationary models
• Black holes with non-minimal derivative coupling
• Reheating predictions in single field inflation
• The Powers of Monodromy
• Higgs G-inflation
• UV-Protected Inflation
• Reheating temperature from the CMB
• Probing reheating with primordial spectrum
• Prospects of determination of reheating temperature after inflation by DECIGO
• Self-unitarization of New Higgs Inflation and compatibility with Planck and BICEP2 data
• Exponential potential for an inflaton with nonminimal kinetic coupling and its supergravity embedding
• Higher Derivative D-term Inflation in New-minimal Supergravity

Cited by in corpus (1)

• CMB constraints on the inflaton couplings and reheating temperature in $\alpha$-attractor inflation