Cosmological perturbations in warm-tachyon inflationary universe model with viscous pressure on the brane

Abstract

We study warm-viscous inflationary universe model on the brane, in a tachyon field theory. We obtain the general conditions which are required for this model to be realizable. In longitudinal gauge, the primoradial perturbation parameters are found in great details, using slow-roll and quasi-stable approximations. The general expressions of the tensor-to-scalar ratio, scalar spectral index and its running are found. We derive the characteristics of the inflationary universe model by using an effective exponential potential in two cases: 1- Dissipative parameter $\Gamma$ and bulk viscous parameter $\zeta$ are constant parameters. 2- Dissipative parameter as a function of tachyon field $\varphi$ and bulk viscous parameter as a function of radiation-matter mixture energy density $\rho$. The parameters of the model are restricted by recent observational data from the seven-year Wilkinson microwave anisotropy probe (WMAP7).

27 pages, 6 figures, accepted for publication by JHEP

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• Tachyon-Warm Intermediate and Logamediate Inflation in the Brane-World Model in the Light of Planck Data
• On the consistency of tachyon warm inflation with viscous pressure
• Constant roll warm inflation in high dissipative regime
• Tachyon inflation in an AdS braneworld with back-reaction
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Particle creation and reheating in a braneworld inflationary scenario
• Israel-Stewart approach to viscous dissipative extended holographic Ricci dark energy dominated universe
• Tachyon warm inflation with the effects of Loop Quantum Cosmology in the light of Planck 2015
• Thermal relics in cosmology with bulk viscosity
• Tachyon Logamediate inflation on the brane
• Inflation driven by q-de Sitter
• Constant-roll inflation with tachyon field in the holographic braneworld