There exists a constant value of H ( z ) at z = -1 when in \omega CDM universe with \omega > -1 , which is independent on other cosmological parameters .
We first combine this theoretical H ( z ) value with the latest 43 observational H ( z ) data ( OHD ) to perform the model-independent Gaussian Processes ( GP ) and constrain the Hubble constant .
We obtain H _ { 0 } =67.67 \pm 3.03 { km s ^ { -1 } Mpc ^ { -1 } } , which is in agreement with H _ { 0 } values from Plank Collaboration ( 2015 ) ( 0.24 \sigma tension ) but a larger deviation from Riess et al .
( 2016 ) ( 1.60 \sigma tension ) , while H _ { 0 } =71.09 \pm 3.71 { km s ^ { -1 } Mpc ^ { -1 } } ( 0.64 \sigma tension ) by only using latest 43 OHD .
Using this H _ { 0 } value , we perform \chi ^ { 2 } statistics with Markov Chain Monte Carlo ( MCMC ) method to constrain cosmological parameters .
We obtain \Omega _ { M } = 0.26 \pm 0.02 and \omega = -0.85 \pm 0.06 in flat \omega CDM model , and \Omega _ { M } = 0.27 \pm 0.04 , \Omega _ { \Lambda } = 0.80 \pm 0.12 and \omega = -0.82 \pm 0.07 in non-flat \omega CDM model , which are larger than those not using the theoretical H ( z ) value .