The neutrino mass bound from WMAP 3 year data, the baryon acoustic peak, the SNLS supernovae and the Lymanα forest
Abstract
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 (BAO) peak, the Type Ia supernovae from SNLS, and the Lymanα 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% confidence limit (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_{ν} = 3, w = 1, and α_{s} = 0, we find a bound of 0.48 eV without using the Lymanα data. If the Lymanα data are used, the bound shrinks to \sum m_\nu \leq 0.2\mbox {}0.4 eV (95% C.L.), depending strongly on the Lymanα analysis used. Finally, we have also calculated how the effective Aparameter used in the SDSS BAO analyses changes under the influence of a nonzero neutrino mass. We find that A = 0.469(n/0.98)^{0.35}(1+0.94Ω_{ν}/Ω_{m}) ± 0.017.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 June 2006
 DOI:
 10.1088/14757516/2006/06/019
 arXiv:
 arXiv:astroph/0602155
 Bibcode:
 2006JCAP...06..019G
 Keywords:

 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 13 pages, 3 figures, matches version to appear in JCAP. The paper now includes an analysis with the WMAP3 data. It also includes an improved analysis of the SDSS Baryon Acoustic Oscillation data, providing a new analytic fitting formula for the inclusion of nonzero neutrino masses in the BAO data analysis