Warm Inflation with Nonminimal Derivative Coupling

Kourosh Nozari,N Rashidi,M Shoukrani

doi:10.1155/2014/343819

Abstract

We study the effects of the nonminimal derivative coupling on the dissipative dynamics of the warm inflation where the scalar field is nonminimally coupled to gravity via its kinetic term. We present a detailed calculation of the cosmological perturbations in this setup. We use the recent observational data from the joint data set of WMAP9 + BAO +H0and also the Planck satellite data to constrain our model parameters for natural and chaotic inflation potentials. We study also the levels of non-Gaussianity in this warm inflation model and we confront the result with recent observational data from the Planck satellite.

Highlights

IntroductionTo preserve the Higgs field as an inflaton candidate, a model has been postulated in which the Higgs field is nonminimally coupled to gravity [10]
The hot big bang scenario has considerable successes in explaining the general properties of our universe, this model cannot address properly some issues such as flatness, horizon, and relics problems
Matter fields interact with particles that are in a thermal bath with mean temperature smaller than the grand unified theories (GUT) critical temperature [8]

Summary

Introduction

To preserve the Higgs field as an inflaton candidate, a model has been postulated in which the Higgs field is nonminimally coupled to gravity [10]. If gravity is nonminimally coupled to derivatives of the scalar field, the unitary bound is preserved during inflation. This model can explain the inflationary phase properly [14, 15]. The present study is devoted to filling this gap With these preliminaries, the goal of the present study is to investigate the effects of the nonminimal derivative coupling on the dissipative dynamics of the warm inflation. We investigate the effects of the nonminimal derivative coupling and dissipation on the inflationary dynamics of the model. We study the levels of nonGaussianity in this scenario and we confront the obtained results with the recent observational data from the Planck satellite

The Setup

Perturbations

Specific Examples

Non-Gaussianity

Conclusion