تقرير
Study of warm inflationary models and their parameter estimation from CMB
العنوان: | Study of warm inflationary models and their parameter estimation from CMB |
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المؤلفون: | Arya, Richa, Rangarajan, Raghavan |
المصدر: | International Journal of Modern Physics D Vol. 29, No. 08, 2050055 (2020) |
سنة النشر: | 2018 |
المجموعة: | Astrophysics High Energy Physics - Phenomenology |
مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology |
الوصف: | Observations of the temperature anisotropies in the Cosmic Microwave Background (CMB) radiation show that the models of inflation with the monomial potentials are inconsistent with the allowed $n_s-r$ bounds. However certain monomial potentials of inflation are allowed in the context of \textit{Warm Inflation}, where the inflaton's coupling with other fields are significant both \textit{during and after} the inflationary phase. In our study, we consider $\lambda\phi^4$ and $\lambda\phi^6$ models of warm inflation with different forms of the inflaton dissipation coefficient. We parameterize the primordial power spectrum in terms of the model parameters, namely, the inflaton self coupling, $\lambda$, and the dissipation parameter, $Q_P$, due to inflaton's interaction with the other fields. Then we obtain the joint and marginal distributions of these parameters by carrying out a Markov Chain Monte Carlo (MCMC) analysis using the {\tt CosmoMC} numerical code. An estimation of these physical parameters is essential for model building. We also obtain the $n_s$ and $r$ values for the mean values of the parameters and find them to be consistent with the observational bounds, confirming that these simple models are viable models for describing inflation. Comment: 25 pages, 6 figures, and 5 tables |
نوع الوثيقة: | Working Paper |
DOI: | 10.1142/S0218271820500558 |
URL الوصول: | http://arxiv.org/abs/1812.03107 |
رقم الأكسشن: | edsarx.1812.03107 |
قاعدة البيانات: | arXiv |
DOI: | 10.1142/S0218271820500558 |
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