Study of warm inflationary models and their parameter estimation from CMB

التفاصيل البيبلوغرافية
العنوان: Study of warm inflationary models and their parameter estimation from CMB
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
الوصف
DOI:10.1142/S0218271820500558