Revised WMAP constraints on neutrino masses and other extensions of the minimal ΛCDM model

Recently, two issues concerning the three-year Wilkinson Microwave Anisotropy Probe (WMAP) likelihood code were pointed out. On large angular scales (l less than or similar to 30), a suboptimal likelihood approximation resulted in a small power excess. On small angular scales (l greater than or similar to 300), over-subtraction of unresolved point sources produced a small power deficit. For a minimal six-parameter cosmological model, these two effects conspired to decrease the value of n(s) by similar to 0.7 sigma. In this paper, we study the change in preferred parameter ranges for extended cosmological models, including running of n(s), massive neutrinos, curvature, and the equation of state for dark energy. We also include large-scale structure and supernova data in our analysis. We find that the parameter ranges for alpha(s), Omega(k) and w are not much altered by the modified analysis. For massive neutrinos the upper limit on the sum of the neutrino masses decreases from M-nu < 1.90 eV to M-nu < 1.57 eV when using the modified WMAP code and WMAP data only. We also find that the shift of n(s) to higher values is quite robust to these extensions of the minimal cosmological model.