Constraints on Neutrino Masses from Weak Lensing

Details Constraints on Neutrino Masses from Weak Lensing Constraints on Neutrino Masses from Weak Lensing

2008-10-28

arxiv.org/abs/0810.4921v3

Phys.Rev.D79:023520,2009

Astronomy and Astrophysics

Astrophysics

16 pages, 10 figures. References added, accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.79.023520

The weak lensing (WL) distortions of distant galaxy images are sensitive to neutrino masses by probing the suppression effect on clustering strengths of total matter in large-scale structure. We use the latest measurement of WL correlations, the CFHTLS data, to explore constraints on neutrino masses. We find that, while the WL data alone cannot place a stringent limit on neutrino masses due to parameter degeneracies, the constraint can be significantly improved when combined with other cosmological probes, the WMAP 5-year (WMAP5) data and the distance measurements of type-Ia supernovae (SNe) and baryon acoustic oscillations (BAO). The upper bounds on the sum of neutrino masses are m_tot = 1.1, 0.76 and 0.54 eV (95% CL) for WL+WMAP5, WMAP5+SNe+BAO, and WL+WMAP5+SNe+BAO, respectively, assuming a flat LCDM model with finite-mass neutrinos. In deriving these constraints, our analysis includes the non-Gaussian covariances of the WL correlation functions to properly take into account significant correlations between different angles.

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