We use measurements of luminosity-dependent galaxy bias at several different redshifts , SDSS at z = 0.05 , DEEP2 at z = 1 and LBGs at z = 3.8 , combined with WMAP five-year cosmic microwave background anisotropy data and SDSS Red Luminous Galaxy survey three-dimensional clustering power spectrum to put constraints on cosmological parameters .
Fitting this combined dataset , we show that the luminosity-dependent bias data that probe the relation between halo bias and halo mass and its redshift evolution are very sensitive to sum of the neutrino masses : in particular we obtain the upper limit of \sum m _ { \nu } < 0.28 eV at the 95 \% confidence level for a \Lambda CDM + m _ { \nu } model , with a \sigma _ { 8 } equal to \sigma _ { 8 } = 0.759 \pm 0.025 ( 1 \sigma ) .
When we allow the dark energy equation of state parameter w to vary we find w = -1.30 \pm 0.19 for a general wCDM + m _ { \nu } model with the 95 % confidence level upper limit on the neutrino masses at \sum m _ { \nu } < 0.59 eV .
The constraint on the dark energy equation of state further improves to w = -1.125 \pm 0.092 when using also ACBAR and supernovae Union data , in addition to above , with a prior on the Hubble constant from the Hubble Space Telescope .