We have studied bounds on the neutrino mass using new data from the WMAP 3 year data , the Sloan Digital Sky Survey measurement of the baryon acoustic peak , the Type Ia supernovae from SNLS , and the Lyman- \alpha forest .
We find that even in the most general models with a running spectral index where the number of neutrinos and the dark energy equation of state are allowed to vary , the 95 % C.L .
bound on the sum of neutrino masses is \sum m _ { \nu } \leq 0.62 eV ( 95 % C.L .
) , a bound which we believe to be robust .
In the more often used constrained analysis with N _ { \nu } = 3 , w = -1 , and \alpha _ { s } = 0 , we find a bound of 0.48 eV without using the Lyman- \alpha data .
If Lyman- \alpha data is used , the bound shrinks to \sum m _ { \nu } \leq 0.2 - 0.4 eV ( 95 % C.L .
) , depending strongly on the Lyman- \alpha analysis used .