Abstract
We present a new limit of ( CL) on the sum of the neutrino masses assuming a flat cosmology. This relaxes slightly to and when quasinonlinear scales are removed and , respectively. These are derived from a new photometric catalogue of over 700 000 luminous red galaxies (MegaZ DR7) with a volume of and redshift range . The data are combined with WMAP 5-year CMB, baryon acoustic oscillations, supernovae, and a Hubble Space Telescope prior on . When combined with WMAP these data are as constraining as adding all supernovae and baryon oscillation data available. The upper limit is one of the tightest constraints on the neutrino from cosmology or particle physics. Further, if these bounds hold, they all predict that current-to-next generation neutrino experiments, such as KATRIN, are unlikely to obtain a detection.
- Received 27 November 2009
DOI:https://doi.org/10.1103/PhysRevLett.105.031301
©2010 American Physical Society
Viewpoint
Galaxies weigh in on neutrinos
Published 12 July 2010
A comparison between the density in surrounding galaxies today and a few billion years ago provides a new upper bound on neutrino mass.
See more in Physics