Abstract
We revisit the constraints on inflation models by using the current cosmological observations involving the latest local measurement of the Hubble constant (H_{0} = 73.00pm 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 H_0. In order to relieve the tension between the local determination of the Hubble constant and the other astrophysical observations, we consider the additional parameter N_mathrm{eff} in the cosmological model. We find that, for the Lambda CDM+r+N_mathrm{eff} model, the scale invariance is only excluded at the 3.3sigma level, and Delta N_mathrm{eff}>0 is favored at the 1.6sigma level. Comparing the obtained 1sigma and 2sigma contours of (n_s,r) with the theoretical predictions of selected inflation models, we find that both the convex and the concave potentials are favored at 2sigma level, the natural inflation model is excluded at more than 2sigma level, the Starobinsky R^2 inflation model is only favored at around 2sigma level, and the spontaneously broken SUSY inflation model is now the most favored model.
Highlights
Inflation took place at energy scale as high as 1016 GeV, where particle physics remains elusive, hundreds of different theoretical scenarios have been proposed
In order to relieve the tension between the local determination of the Hubble constant and other astrophysical observations, we decide to consider dark radiation, parametrized by Neff, in the cosmological model in our analysis
We investigate how the constraints on the inflation models are affected by considering the latest local measurement of the Hubble constant in the cosmological global fit
Summary
Inflation took place at energy scale as high as 1016 GeV, where particle physics remains elusive, hundreds of different theoretical scenarios have been proposed. The constraint on the tensor-to-scalar ratio is r0.002 < 0.11 at the 2σ level, derived by using the Planck temperature data combined with the Planck lensing likelihood. We combine the new measurement of H0 with the Planck data, the BICEP2/Keck Array data and the BAO data to constrain inflation models. 3, we report the results of the constraints on the primordial power spectra with the combination of the Planck data, the BICEP2/Keck Array data, the BAO data and the latest measurement of H0. 4, we compare the constraint results of (ns, r ) with the theoretical predictions of some typical inflationary models and show the impacts of the latest measurement of H0 on the selection of the inflation model.
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