Constraints on the generalized natural inflation after Planck 2018 |
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Authors: | Nan Zhang Ya-Bo Wu Jun-Wang Lu Chu-Wen Sun Li-Jie Shou Hai-Zhou Xu |
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Institution: | 1. Department of Physics, Liaoning Normal University, Dalian 116029, China2. School of Physics and Electronics, Qiannan Normal University for Nationalities, Duyun 558000, China |
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Abstract: | Based on the dynamics of single scalar field slow-roll inflation and the theory of reheating, we investigate the generalized natural inflationary (GNI) model. We introduce constraints on the scalar spectral index \begin{document}$n_{s}$\end{document}![]() and the tensor-to scalar ratio r for the \begin{document}$\Lambda$\end{document}![]() CDM \begin{document}$+r$\end{document}![]() model, according to the latest data from Planck 2018 TT, TE, EE+low E+lensing (P18) and BICEP2/Keck 2015 season (BK15), i.e., with \begin{document}$n_{s}=0.9659\pm0.0044$\end{document}![]() at 68% confidence level (CL), and \begin{document}$r<0.0623$\end{document}![]() at 95% CL. We find that the GNI model is favored by P18 and BK15 in the ranges \begin{document}$\log_{10}(f/M_{p})= 0.62^{+0.17}_{-0.18}$\end{document}![]() and \begin{document}$m=0.35^{+0.13}_{-0.23}$\end{document}![]() at 68% CL. In addition, the corresponding predictions of generalized and two-phase reheating are discussed. It follows that the parameter m has significant effect on the model behavior. |
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Keywords: | early universe inflation model of inflation observational tests of inflation reheating |
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