Warm-viscous inflation model on the brane in the light of BICEP2

TL;DR

This paper explores a warm viscous inflation model on the brane, deriving conditions and expressions for perturbations, and constrains the model using recent observational data from WMAP9, Planck, and BICEP2.

Contribution

It introduces a novel warm inflation model with viscous pressure on the brane, providing analytic expressions and observational constraints.

Findings

Derived conditions for model realizability in slow-roll approximation.

Obtained analytic expressions for density and tensor perturbations.

Constrained model parameters using WMAP9, Planck, and BICEP2 data.

Abstract

In the present work warm inflationary universe model with viscous pressure on the brane in high-dissipation regime is studied. We derive a condition which is required for this model to be realizable in slow-roll approximation. We also present analytic expressions for density perturbation and amplitude of tensor perturbation in longitudinal gauge. General expressions of tensor-to-scalar ratio, scalar spectral index and its running are obtained. We develop our model by using chaotic potential, the characteristics of this model are calculated for two specific cases: 1- Dissipative parameter $\Gamma$ and bulk viscous parameter $\zeta$ are constant parameters. 2- Dissipative parameter as a function of scalar field $\phi$ and bulk viscous parameter as a function of radiation-matter mixture energy density $\rho$. The parameters of the model are restricted by WMAP9, Planck and BICEP2 observational data.