Warm-Intermediate Inflationary Universe Model with Viscous Pressure in High Dissipative Regime

Abstract

Warm inflation model with bulk viscous pressure in the context of "intermediate inflation" where the cosmological scale factor expands as $a(t)=a_0\exp (A{t}^f)$, is studied. The characteristics of this model in slow-roll approximation and in high dissipative regime are presented in two cases: 1- Dissipative parameter $\Gamma$ as a function of scalar field $\varphi$ and bulk viscous coefficient $\zeta$ as a function of energy density $\rho$. 2- $\Gamma$ and $\zeta$ are constant parameters. Scalar, tensor perturbations and spectral indices for this scenario are obtained. The cosmological parameters appearing in the present model are constrained by recent observational data (WMAP7).

17 pages, 4 figures, accepted for publication in General Relativity and Gravitation. arXiv admin note: substantial text overlap with arXiv:1312.2832, arXiv:1302.0493

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Cited by in corpus (4)

• Viscous Cosmology for Early- and Late-Time Universe
• Recent developments in warm inflation
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Thermal relics in cosmology with bulk viscosity