Abstract
Cosmic Microwave Background (CMB) anisotropy encodes a lot of information about our Universe. In this paper we take the ground-based CMB observations (GCMB), including the South Pole Telescope (SPT), SPTpol and the Atacama Cosmology Telescope Polarimeter (ACTPol), as a new probe to the CMB anisotropy independent of two satellite observations, i.e. Wilkinson Microwave Anisotropy Probe (WMAP) and Planck. The combination of current GCMB data is consistent with WMAP and Planck. In the spatially flat ΛCDM model, the Hubble constant is H0=69.72± 1.63 km/s/Mpc at 68% confidence level (CL). Combining with baryon acoustic oscillation (BAO) and the Pantheon sample of Type Ia supernovae (SN), we find that H0=68.40± 0.58 km/s/Mpc (68% CL) in the spatially flat ΛCDM cosmology which has a tension with local measurement given by Riess et al. in 2019 at 3.7σ level, and Ωk=−0.0013± 0.0039 and Neff=2.90± 0.41 (68% CL) in the extended cosmological models.
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