Constraints on H0 from WMAP and BAO Measurements

We report the constraints of Hobtained from Wilkinson Microwave Anisotropy Probe(WMAP)9-year data combined with the latest baryonic acoustic oscillations(BAO)measurements.We use the BAO measurements from 6dF Galaxy Survey(6dFGS),the SDSS DR7 main galaxies sample(MGS),the BOSS DR12 galaxies,and the eBOSSDR14 quasars.Adding the recent BAO measurements to the cosmic microwave background(CMB)data from WMAP,we constrain cosmological parameters ?=0.298±0.005,H=68.36km·s·Mpc,σ=0.8170in a spatially flatΛcold dark matter(ΛCDM)model,and ?=0.302±0.008,H=67.63±1.30 km·s·Mpc,σ=0.7988in a spatially flat w CDM model,respectively.Our measured Hresults prefer a value lower than 70km·s·Mpc,consistent with the recent data on CMB constraints from Planck(2018),but in 3.1 and 3.5σ tension with local measurements of SH0ES(2018)inΛCDM and wCDM framework,respectively.Our results indicate that there is a systematic tension on the Hubble constant between SH0ES and the combination of CMB and BAO datasets.