2017/04/30 by Rui-Yun Guo, Xin Zhang
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmic background radiation #Cosmic microwave background #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Hubble volume #Hubble's law #Inflation (cosmology) #Particle physics theoretical and experimental studies #Planck #Spectral density #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1140/epjc/s10052-017-5454-9
published as Eur. Phys. J. C (2017) 77: 882 · 10 pages, 6 figures
openalex created_date 2017/04/28 · arxiv created 2017/10/25 · openalex publication_date 2017/12/01 · arxiv updated 2017/12/20 · openalex updated_date 2026/08/05
We revisit the constraints on inflation models by using the current cosmological observations involving the latest local measurement of the Hubble constant ( H0 = 73.00± 1.75 km s -1 Mpc -1 ). We constrain the primordial power spectra of both scalar and tensor perturbations with the observational data including the Planck 2015 CMB full data, the BICEP2 and Keck Array CMB B-mode data, the BAO data, and the direct measurement of H0 . In order to relieve the tension between the local determination of the Hubble constant and the other astrophysical observations, we consider the additional parameter Neff in the cosmological model. We find that, for the Λ CDM + r + Neff model, the scale invariance is only excluded at the 3.3 σ level, and Δ Neff>0 is favored at the 1.6 σ level. Comparing the obtained 1 σ and 2 σ contours of (ns,r) with the theoretical predictions of selected inflation models, we find that both the convex and the concave potentials are favored at 2 σ level, the natural inflation model is excluded at more than 2 σ level, the Starobinsky R2 inflation model is only favored at around 2 σ level, and the spontaneously broken SUSY inflation model is now the most favored model.