Tachyon Warm-Logamediate Inflationary Universe Model in High Dissipative Regime

Abstract

In the present work, we study warm tachyon inflation model in the context of "logamediate inflation" where the cosmological scale factor expands as $a=a_0\exp (A[\ln t{]}^{\lambda })$. The characteristics of this model in slow-roll approximation are presented in two cases: 1- Dissipative parameter $\Gamma$ is a function of tachyon field $\varphi$. 2- $\Gamma$ is a constant parameter. The level of non-Gaussianity of this model is found for these two cases. Scalar and tensor perturbations for this scenario are presented. The parameters appearing in our model are constrained by recent observational data (WMAP7). Harrison-Zeldovich spectrum, i.e. $n_s=1,$ is approximately obtained for large values of $\lambda$ (i.e. $\lambda \simeq 50$)and normal value of number of e-folds, i.e. $N\simeq 60$. On the other hand, the scale invariant spectrum (Harrison-Zeldovich spectrum) is given by using two parameters in our model. For intermediate inflation, where the cosmological scale factor expands as $a=a_0\exp (A{t}^f),$ this spectrum has been exactly obtained using one parameter, i.e. $f=2/3$ \cite{2-n}.

17 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1210.0742

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• Constant roll warm inflation in high dissipative regime
• Constructing warm inflationary model in brane-antibrane system
• Dynamics of Polynomial Chaplygin Gas Warm Inflation
• Role of higher -dimensional evolving wormholes in the formation of a big rip singularity
• Logamediate Inflation by Tachyon Field
• Tachyon warm inflation with the effects of Loop Quantum Cosmology in the light of Planck 2015
• Tachyon Logamediate inflation on the brane
• Warm Modified Chaplygin Gas Shaft Inflation
• Inflation driven by q-de Sitter
• Inflationary Solution of Hamilton Jacobi Equations during Weak Dissipative Regime