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

Constraints on the generalized natural inflation after Planck 2018

Cosmology and Nongalactic Astrophysics 2020-07-02 v4 General Relativity and Quantum Cosmology

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

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. Concretely, we give constraints on the scalar spectral index $n_{s}$ and tensor-to scalar ratio $r$ for $\Lambda$ 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.

Keywords

generalized natural inflation Planck 2018 scalar spectral index tensor-to-scalar ratio reheating cosmological constraints

Cite

@article{arxiv.1807.03596,
  title  = {Constraints on the generalized natural inflation after Planck 2018},
  author = {Nan Zhang and Ya-Bo Wu and Jun-Wang Lu and Chu-Wen Sun and Li-Jie Shou and Hai-Zhou Xu},
  journal= {arXiv preprint arXiv:1807.03596},
  year   = {2020}
}

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15 pages, 15 figures, accepted for publication in CPC

Constraints on the generalized natural inflation after Planck 2018

Abstract

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