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arXiv 1807.03596astro-ph.COgr-qc
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普朗克2018年后广义自然暴胀的约束条件

Constraints on the generalized natural inflation after Planck 2018

Nan Zhang, Ya-Bo Wu, Jun-Wang Lu, Chu-Wen Sun, Li-Jie Shou, Hai-Zhou Xu

摘要:

基于单标量场慢卷暴胀动力学和再加热理论,研究了广义自然暴胀(GNI)模型。具体地,我们根据Plack 2018 TT,TE,EE+lowE+透镜(P18)和BICEP 2/Keck 2015季节(BK 15)的最新数据,给出了$Λ$ CDM $+r$模型的标量谱指数$n_{s}$和张量标量比$r$的约束条件,即,$68\%$置信水平(CL)下的$n_{s}=0.9659\pm0.0044$和$95\%$ CL下的$r<0.0623$。我们发现GNI模型在$68\%$ CL的$\log_{10}(f/M_{p})=0.62^{+0.17}_{-0.18}$和$m=0.35^{+0.13}_{-0.23}$范围内受到P18加BK 15的青睐。此外,还分别讨论了一般再加热和两相再加热的相应预测。由此可见,参数$m$对模型的行为有着显著的影响。

英文摘要:

Based on the dynamics of single scalar field slow-roll inflation and the theory of reheating, we investigate the generalized natural inflationary (GNI) model. Concretely, we give constraints on the scalar spectral index $n_{s}$ and tensor-to scalar ratio $r$ for $Λ$CDM $+r$ model according to the latest data from Plack 2018 TT,TE,EE+lowE+lensing (P18) and BICEP2/Keck 2015 season (BK15), i.e., $n_{s}=0.9659\pm0.0044$ at $68\%$ confidence level (CL) and $r<0.0623$ at $95\%$CL. We find that the GNI model is favored by P18 plus BK15 in the ranges of $\log_{10}(f/M_{p})=0.62^{+0.17}_{-0.18}$ and $m=0.35^{+0.13}_{-0.23}$ at $68\%$CL. In addition, the corresponding predictions of the general and two-phase reheating are respectively discussed. It follows that the parameter $m$ has the significant effect on the model behaviors.

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