TY  - JOUR
AU  - Reid, B. A.
AU  - Verde, L.
AU  - Jimenez, R.
AU  - Mena, O.
PY  - 2010
DA  - 2010//
TI  - Robust neutrino constraints by combining low redshift observations with the CMB
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 003
EP  - 21pp
VL  - 01
IS  - 1
PB  - Iop Publishing Ltd
KW  - cluster counts
KW  - cosmological parameters from LSS
KW  - neutrino masses from cosmology
KW  - cosmological parameters from CMBR
AB  - We illustrate how recently improved low-redshift cosmological measurements can tighten constraints on neutrino properties. In particular we examine the impact of the assumed cosmological model on the constraints. We first consider the new HST H-0 = 74.2 +/- 3.6 measurement by Riess et al. (2009) and the sigma(8)(Omega(m)/0.25)(0.41) = 0.832 +/- 0.033 constraint from Rozo et al. (2009) derived from the SDSS maxBCG Cluster Catalog. In a ACDM model and when combined with WMAP5 constraints, these low-redshift measurements constrain Sigma m(v) < 0.4 eV at the 95% confidence level. This bound does not relax when allowing for the running of the spectral index or for primordial tensor perturbations. When adding also Supernovae and BAO constraints, we obtain a 95% upper limit of Sigma m(v) < 0.3eV. We test the sensitivity of the neutrino mass constraint to the assumed expansion history by both allowing a dark energy equation of state parameter w not equal -1 and by studying a model with coupling between dark energy and dark matter, which allows for variation in w, Omega(k), and dark coupling strength xi. When combining CMB, H-0 and the SDSS LRG halo power spectrum from Reid et al. 2009, we find that in this very general model, Sigma m(v) < 0.51 eV with 95% confidence. If we allow the number of relativistic species N-rel to vary in a ACDM model with Sigma m(v) = 0, we find N-rel = 3.76(-0.68)(+0.63)(+1.38 -1.21) for the 68% and 95% confidence intervals. We also report prior-independent constraints, which are in excellent agreement with the Bayesian constraints.
SN  - 1475-7516
UR  - http://arxiv.org/abs/arXiv:0910.0008
UR  - https://doi.org/10.1088/1475-7516/2010/01/003
DO  - 10.1088/1475-7516/2010/01/003
LA  - English
N1  - ISI:000273314600008
ID  - Reid_etal2010
ER  -