Cosmological Constraints from Hubble parameter $H(z)$ and SN Ia   observations
  In this paper, we use a set of observational $H(z)$ data (OHD) to constrain the $\Lambda$CDM cosmology. This data set can be derived from the differential ages of the passively evolving galaxies. Meanwhile, the $\mathcal {A}$-parameter, which describes the Baryonic Acoustic Oscillation (BAO) peak, and the newly measured value of the Cosmic Microwave Background (CMB) shift parameter $\mathcal {R}$ are used to present combinational constraints on the same cosmology. The combinational constraints favor an accelerating flat universe while the flat $\Lambda$CDM cosmology is also analyzed in the same way. We obtain a result compatible with that by many other independent cosmological observations. We find that the observational $H(z)$ data set is a complementarity to other cosmological probes. 
Hui Lin (1), Cheng Hao (1), Xiao Wang (1), Qiang Yuan (2), Ze-Long Yi   (3), Tong-Jie Zhang (3,4), Bao-Quan Wang (5)((1)Scho...